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6(15-x)=40-x
We move all terms to the left:
6(15-x)-(40-x)=0
We add all the numbers together, and all the variables
6(-1x+15)-(-1x+40)=0
We multiply parentheses
-6x-(-1x+40)+90=0
We get rid of parentheses
-6x+1x-40+90=0
We add all the numbers together, and all the variables
-5x+50=0
We move all terms containing x to the left, all other terms to the right
-5x=-50
x=-50/-5
x=+10
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