(1-7a)(1-3a)=

Solution for (1-7a)(1-3a)= equation:

Simplifying
(1 + -7a)(1 + -3a) = 0

Multiply (1 + -7a) * (1 + -3a)
(1(1 + -3a) + -7a * (1 + -3a)) = 0
((1 * 1 + -3a * 1) + -7a * (1 + -3a)) = 0
((1 + -3a) + -7a * (1 + -3a)) = 0
(1 + -3a + (1 * -7a + -3a * -7a)) = 0
(1 + -3a + (-7a + 21a2)) = 0

Combine like terms: -3a + -7a = -10a
(1 + -10a + 21a2) = 0

Solving
1 + -10a + 21a2 = 0

Solving for variable 'a'.

Factor a trinomial.
(1 + -7a)(1 + -3a) = 0

Subproblem 1
Set the factor '(1 + -7a)' equal to zero and attempt to solve:

Simplifying
1 + -7a = 0

Solving
1 + -7a = 0

Move all terms containing a to the left, all other terms to the right.

Add '-1' to each side of the equation.
1 + -1 + -7a = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -7a = 0 + -1
-7a = 0 + -1

Combine like terms: 0 + -1 = -1
-7a = -1

Divide each side by '-7'.
a = 0.1428571429

Simplifying
a = 0.1428571429
Subproblem 2
Set the factor '(1 + -3a)' equal to zero and attempt to solve:

Simplifying
1 + -3a = 0

Solving
1 + -3a = 0

Move all terms containing a to the left, all other terms to the right.

Add '-1' to each side of the equation.
1 + -1 + -3a = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -3a = 0 + -1
-3a = 0 + -1

Combine like terms: 0 + -1 = -1
-3a = -1

Divide each side by '-3'.
a = 0.3333333333

Simplifying
a = 0.3333333333
Solution
a = {0.1428571429, 0.3333333333}