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5x=-2x-20
We move all terms to the left:
5x-(-2x-20)=0
We get rid of parentheses
5x+2x+20=0
We add all the numbers together, and all the variables
7x+20=0
We move all terms containing x to the left, all other terms to the right
7x=-20
x=-20/7
x=-2+6/7
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