x+3x-7-8=12

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Solution for x+3x-7-8=12 equation:


Simplifying
x + 3x + -7 + -8 = 12

Reorder the terms:
-7 + -8 + x + 3x = 12

Combine like terms: -7 + -8 = -15
-15 + x + 3x = 12

Combine like terms: x + 3x = 4x
-15 + 4x = 12

Solving
-15 + 4x = 12

Solving for variable 'x'.

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

Add '15' to each side of the equation.
-15 + 15 + 4x = 12 + 15

Combine like terms: -15 + 15 = 0
0 + 4x = 12 + 15
4x = 12 + 15

Combine like terms: 12 + 15 = 27
4x = 27

Divide each side by '4'.
x = 6.75

Simplifying
x = 6.75

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