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-17-7x=21-5x
We move all terms to the left:
-17-7x-(21-5x)=0
We add all the numbers together, and all the variables
-7x-(-5x+21)-17=0
We get rid of parentheses
-7x+5x-21-17=0
We add all the numbers together, and all the variables
-2x-38=0
We move all terms containing x to the left, all other terms to the right
-2x=38
x=38/-2
x=-19
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