x+3+12+x=13

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Solution for x+3+12+x=13 equation: 


Simplifying
x + 3 + 12 + x = 13

Reorder the terms:
3 + 12 + x + x = 13

Combine like terms: 3 + 12 = 15
15 + x + x = 13

Combine like terms: x + x = 2x
15 + 2x = 13

Solving
15 + 2x = 13

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 + 2x = 13 + -15

Combine like terms: 15 + -15 = 0
0 + 2x = 13 + -15
2x = 13 + -15

Combine like terms: 13 + -15 = -2
2x = -2

Divide each side by '2'.
x = -1

Simplifying
x = -1

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