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4x+5(2-x)=0
We add all the numbers together, and all the variables
4x+5(-1x+2)=0
We multiply parentheses
4x-5x+10=0
We add all the numbers together, and all the variables
-1x+10=0
We move all terms containing x to the left, all other terms to the right
-x=-10
x=-10/-1
x=+10
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