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2x-5(x-2)=-9+5x-21
We move all terms to the left:
2x-5(x-2)-(-9+5x-21)=0
We add all the numbers together, and all the variables
2x-5(x-2)-(5x-30)=0
We multiply parentheses
2x-5x-(5x-30)+10=0
We get rid of parentheses
2x-5x-5x+30+10=0
We add all the numbers together, and all the variables
-8x+40=0
We move all terms containing x to the left, all other terms to the right
-8x=-40
x=-40/-8
x=+5
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