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-10(x-5)=-90
We move all terms to the left:
-10(x-5)-(-90)=0
We add all the numbers together, and all the variables
-10(x-5)+90=0
We multiply parentheses
-10x+50+90=0
We add all the numbers together, and all the variables
-10x+140=0
We move all terms containing x to the left, all other terms to the right
-10x=-140
x=-140/-10
x=+14
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