x+3x-7=13

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Solution for x+3x-7=13 equation: 


Simplifying
x + 3x + -7 = 13

Reorder the terms:
-7 + x + 3x = 13

Combine like terms: x + 3x = 4x
-7 + 4x = 13

Solving
-7 + 4x = 13

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 = 13 + 7

Combine like terms: -7 + 7 = 0
0 + 4x = 13 + 7
4x = 13 + 7

Combine like terms: 13 + 7 = 20
4x = 20

Divide each side by '4'.
x = 5

Simplifying
x = 5

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