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7x=15x-20
We move all terms to the left:
7x-(15x-20)=0
We get rid of parentheses
7x-15x+20=0
We add all the numbers together, and all the variables
-8x+20=0
We move all terms containing x to the left, all other terms to the right
-8x=-20
x=-20/-8
x=2+1/2
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