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85=3x+4x+8
We move all terms to the left:
85-(3x+4x+8)=0
We add all the numbers together, and all the variables
-(7x+8)+85=0
We get rid of parentheses
-7x-8+85=0
We add all the numbers together, and all the variables
-7x+77=0
We move all terms containing x to the left, all other terms to the right
-7x=-77
x=-77/-7
x=+11
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