4a+-7(a+20)=

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

Simplifying
4a + -7(a + 20) = 0

Reorder the terms:
4a + -7(20 + a) = 0
4a + (20 * -7 + a * -7) = 0
4a + (-140 + -7a) = 0

Reorder the terms:
-140 + 4a + -7a = 0

Combine like terms: 4a + -7a = -3a
-140 + -3a = 0

Solving
-140 + -3a = 0

Solving for variable 'a'.

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

Add '140' to each side of the equation.
-140 + 140 + -3a = 0 + 140

Combine like terms: -140 + 140 = 0
0 + -3a = 0 + 140
-3a = 0 + 140

Combine like terms: 0 + 140 = 140
-3a = 140

Divide each side by '-3'.
a = -46.66666667

Simplifying
a = -46.66666667