3a+12=4a+7

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Solution for 3a+12=4a+7 equation:


Simplifying
3a + 12 = 4a + 7

Reorder the terms:
12 + 3a = 4a + 7

Reorder the terms:
12 + 3a = 7 + 4a

Solving
12 + 3a = 7 + 4a

Solving for variable 'a'.

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

Add '-4a' to each side of the equation.
12 + 3a + -4a = 7 + 4a + -4a

Combine like terms: 3a + -4a = -1a
12 + -1a = 7 + 4a + -4a

Combine like terms: 4a + -4a = 0
12 + -1a = 7 + 0
12 + -1a = 7

Add '-12' to each side of the equation.
12 + -12 + -1a = 7 + -12

Combine like terms: 12 + -12 = 0
0 + -1a = 7 + -12
-1a = 7 + -12

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

Divide each side by '-1'.
a = 5

Simplifying
a = 5

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