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17-4x=42-x-7
We move all terms to the left:
17-4x-(42-x-7)=0
We add all the numbers together, and all the variables
-4x-(-1x+35)+17=0
We get rid of parentheses
-4x+1x-35+17=0
We add all the numbers together, and all the variables
-3x-18=0
We move all terms containing x to the left, all other terms to the right
-3x=18
x=18/-3
x=-6
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