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x+3(6-6x)=103
We move all terms to the left:
x+3(6-6x)-(103)=0
We add all the numbers together, and all the variables
x+3(-6x+6)-103=0
We multiply parentheses
x-18x+18-103=0
We add all the numbers together, and all the variables
-17x-85=0
We move all terms containing x to the left, all other terms to the right
-17x=85
x=85/-17
x=-5
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