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6x+42(90+2)=7x+90
We move all terms to the left:
6x+42(90+2)-(7x+90)=0
We add all the numbers together, and all the variables
6x-(7x+90)+4292=0
We get rid of parentheses
6x-7x-90+4292=0
We add all the numbers together, and all the variables
-1x+4202=0
We move all terms containing x to the left, all other terms to the right
-x=-4202
x=-4202/-1
x=+4202
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