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45-10x=15-8x
We move all terms to the left:
45-10x-(15-8x)=0
We add all the numbers together, and all the variables
-10x-(-8x+15)+45=0
We get rid of parentheses
-10x+8x-15+45=0
We add all the numbers together, and all the variables
-2x+30=0
We move all terms containing x to the left, all other terms to the right
-2x=-30
x=-30/-2
x=+15
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