-7+x+3x=9

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Solution for -7+x+3x=9 equation: 


Simplifying
-7 + x + 3x = 9

Combine like terms: x + 3x = 4x
-7 + 4x = 9

Solving
-7 + 4x = 9

Solving for variable 'x'.

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

Add '7' to each side of the equation.
-7 + 7 + 4x = 9 + 7

Combine like terms: -7 + 7 = 0
0 + 4x = 9 + 7
4x = 9 + 7

Combine like terms: 9 + 7 = 16
4x = 16

Divide each side by '4'.
x = 4

Simplifying
x = 4

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