-20-4a=-3(1+7a)

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Solution for -20-4a=-3(1+7a) equation:


Simplifying
-20 + -4a = -3(1 + 7a)
-20 + -4a = (1 * -3 + 7a * -3)
-20 + -4a = (-3 + -21a)

Solving
-20 + -4a = -3 + -21a

Solving for variable 'a'.

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

Add '21a' to each side of the equation.
-20 + -4a + 21a = -3 + -21a + 21a

Combine like terms: -4a + 21a = 17a
-20 + 17a = -3 + -21a + 21a

Combine like terms: -21a + 21a = 0
-20 + 17a = -3 + 0
-20 + 17a = -3

Add '20' to each side of the equation.
-20 + 20 + 17a = -3 + 20

Combine like terms: -20 + 20 = 0
0 + 17a = -3 + 20
17a = -3 + 20

Combine like terms: -3 + 20 = 17
17a = 17

Divide each side by '17'.
a = 1

Simplifying
a = 1

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