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-21x+15=-5x-17
We move all terms to the left:
-21x+15-(-5x-17)=0
We get rid of parentheses
-21x+5x+17+15=0
We add all the numbers together, and all the variables
-16x+32=0
We move all terms containing x to the left, all other terms to the right
-16x=-32
x=-32/-16
x=+2
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