-2a+7a+12-a=18

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Solution for -2a+7a+12-a=18 equation:


Simplifying
-2a + 7a + 12 + -1a = 18

Reorder the terms:
12 + -2a + 7a + -1a = 18

Combine like terms: -2a + 7a = 5a
12 + 5a + -1a = 18

Combine like terms: 5a + -1a = 4a
12 + 4a = 18

Solving
12 + 4a = 18

Solving for variable 'a'.

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

Add '-12' to each side of the equation.
12 + -12 + 4a = 18 + -12

Combine like terms: 12 + -12 = 0
0 + 4a = 18 + -12
4a = 18 + -12

Combine like terms: 18 + -12 = 6
4a = 6

Divide each side by '4'.
a = 1.5

Simplifying
a = 1.5

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