-84=-4(-4a+3)-7a

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Solution for -84=-4(-4a+3)-7a equation:


Simplifying
-84 = -4(-4a + 3) + -7a

Reorder the terms:
-84 = -4(3 + -4a) + -7a
-84 = (3 * -4 + -4a * -4) + -7a
-84 = (-12 + 16a) + -7a

Combine like terms: 16a + -7a = 9a
-84 = -12 + 9a

Solving
-84 = -12 + 9a

Solving for variable 'a'.

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

Add '-9a' to each side of the equation.
-84 + -9a = -12 + 9a + -9a

Combine like terms: 9a + -9a = 0
-84 + -9a = -12 + 0
-84 + -9a = -12

Add '84' to each side of the equation.
-84 + 84 + -9a = -12 + 84

Combine like terms: -84 + 84 = 0
0 + -9a = -12 + 84
-9a = -12 + 84

Combine like terms: -12 + 84 = 72
-9a = 72

Divide each side by '-9'.
a = -8

Simplifying
a = -8

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