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7-7x-2=-21+5x-10
We move all terms to the left:
7-7x-2-(-21+5x-10)=0
We add all the numbers together, and all the variables
-7x-(5x-31)+7-2=0
We add all the numbers together, and all the variables
-7x-(5x-31)+5=0
We get rid of parentheses
-7x-5x+31+5=0
We add all the numbers together, and all the variables
-12x+36=0
We move all terms containing x to the left, all other terms to the right
-12x=-36
x=-36/-12
x=+3
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