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126=7x+5x+6
We move all terms to the left:
126-(7x+5x+6)=0
We add all the numbers together, and all the variables
-(12x+6)+126=0
We get rid of parentheses
-12x-6+126=0
We add all the numbers together, and all the variables
-12x+120=0
We move all terms containing x to the left, all other terms to the right
-12x=-120
x=-120/-12
x=+10
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