a+40+31=8a-13

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Solution for a+40+31=8a-13 equation:


Simplifying
a + 40 + 31 = 8a + -13

Reorder the terms:
40 + 31 + a = 8a + -13

Combine like terms: 40 + 31 = 71
71 + a = 8a + -13

Reorder the terms:
71 + a = -13 + 8a

Solving
71 + a = -13 + 8a

Solving for variable 'a'.

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

Add '-8a' to each side of the equation.
71 + a + -8a = -13 + 8a + -8a

Combine like terms: a + -8a = -7a
71 + -7a = -13 + 8a + -8a

Combine like terms: 8a + -8a = 0
71 + -7a = -13 + 0
71 + -7a = -13

Add '-71' to each side of the equation.
71 + -71 + -7a = -13 + -71

Combine like terms: 71 + -71 = 0
0 + -7a = -13 + -71
-7a = -13 + -71

Combine like terms: -13 + -71 = -84
-7a = -84

Divide each side by '-7'.
a = 12

Simplifying
a = 12

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