3a+12-2a-7=20

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Solution for 3a+12-2a-7=20 equation:


Simplifying
3a + 12 + -2a + -7 = 20

Reorder the terms:
12 + -7 + 3a + -2a = 20

Combine like terms: 12 + -7 = 5
5 + 3a + -2a = 20

Combine like terms: 3a + -2a = 1a
5 + 1a = 20

Solving
5 + 1a = 20

Solving for variable 'a'.

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

Add '-5' to each side of the equation.
5 + -5 + 1a = 20 + -5

Combine like terms: 5 + -5 = 0
0 + 1a = 20 + -5
1a = 20 + -5

Combine like terms: 20 + -5 = 15
1a = 15

Divide each side by '1'.
a = 15

Simplifying
a = 15

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