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17=-4+7x
We move all terms to the left:
17-(-4+7x)=0
We add all the numbers together, and all the variables
-(7x-4)+17=0
We get rid of parentheses
-7x+4+17=0
We add all the numbers together, and all the variables
-7x+21=0
We move all terms containing x to the left, all other terms to the right
-7x=-21
x=-21/-7
x=+3
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