-5x+15+7x=12-18x+21x

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Solution for -5x+15+7x=12-18x+21x equation: 



-5x+15+7x=12-18x+21x

We move all terms to the left:

-5x+15+7x-(12-18x+21x)=0

We add all the numbers together, and all the variables

-5x+7x-(3x+12)+15=0

We add all the numbers together, and all the variables

2x-(3x+12)+15=0

We get rid of parentheses

2x-3x-12+15=0

We add all the numbers together, and all the variables

-1x+3=0

We move all terms containing x to the left, all other terms to the right

-x=-3

x=-3/-1

x=+3

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