31=5a+7-3a

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Solution for 31=5a+7-3a equation:


Simplifying
31 = 5a + 7 + -3a

Reorder the terms:
31 = 7 + 5a + -3a

Combine like terms: 5a + -3a = 2a
31 = 7 + 2a

Solving
31 = 7 + 2a

Solving for variable 'a'.

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

Add '-2a' to each side of the equation.
31 + -2a = 7 + 2a + -2a

Combine like terms: 2a + -2a = 0
31 + -2a = 7 + 0
31 + -2a = 7

Add '-31' to each side of the equation.
31 + -31 + -2a = 7 + -31

Combine like terms: 31 + -31 = 0
0 + -2a = 7 + -31
-2a = 7 + -31

Combine like terms: 7 + -31 = -24
-2a = -24

Divide each side by '-2'.
a = 12

Simplifying
a = 12

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