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694=3x-90+3x+x
We move all terms to the left:
694-(3x-90+3x+x)=0
We add all the numbers together, and all the variables
-(7x-90)+694=0
We get rid of parentheses
-7x+90+694=0
We add all the numbers together, and all the variables
-7x+784=0
We move all terms containing x to the left, all other terms to the right
-7x=-784
x=-784/-7
x=+112
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