-31=-7(a+7)+8(4a-4)

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Solution for -31=-7(a+7)+8(4a-4) equation:


Simplifying
-31 = -7(a + 7) + 8(4a + -4)

Reorder the terms:
-31 = -7(7 + a) + 8(4a + -4)
-31 = (7 * -7 + a * -7) + 8(4a + -4)
-31 = (-49 + -7a) + 8(4a + -4)

Reorder the terms:
-31 = -49 + -7a + 8(-4 + 4a)
-31 = -49 + -7a + (-4 * 8 + 4a * 8)
-31 = -49 + -7a + (-32 + 32a)

Reorder the terms:
-31 = -49 + -32 + -7a + 32a

Combine like terms: -49 + -32 = -81
-31 = -81 + -7a + 32a

Combine like terms: -7a + 32a = 25a
-31 = -81 + 25a

Solving
-31 = -81 + 25a

Solving for variable 'a'.

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

Add '-25a' to each side of the equation.
-31 + -25a = -81 + 25a + -25a

Combine like terms: 25a + -25a = 0
-31 + -25a = -81 + 0
-31 + -25a = -81

Add '31' to each side of the equation.
-31 + 31 + -25a = -81 + 31

Combine like terms: -31 + 31 = 0
0 + -25a = -81 + 31
-25a = -81 + 31

Combine like terms: -81 + 31 = -50
-25a = -50

Divide each side by '-25'.
a = 2

Simplifying
a = 2

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