31=3a+7

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Solution for 31=3a+7 equation:


Simplifying
31 = 3a + 7

Reorder the terms:
31 = 7 + 3a

Solving
31 = 7 + 3a

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
31 + -3a = 7 + 3a + -3a

Combine like terms: 3a + -3a = 0
31 + -3a = 7 + 0
31 + -3a = 7

Add '-31' to each side of the equation.
31 + -31 + -3a = 7 + -31

Combine like terms: 31 + -31 = 0
0 + -3a = 7 + -31
-3a = 7 + -31

Combine like terms: 7 + -31 = -24
-3a = -24

Divide each side by '-3'.
a = 8

Simplifying
a = 8

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