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-10x+(-5x)=45
We move all terms to the left:
-10x+(-5x)-(45)=0
We get rid of parentheses
-10x-5x-45=0
We add all the numbers together, and all the variables
-15x-45=0
We move all terms containing x to the left, all other terms to the right
-15x=45
x=45/-15
x=-3
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