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(15-x)-10=-30
We move all terms to the left:
(15-x)-10-(-30)=0
We add all the numbers together, and all the variables
(-1x+15)-10-(-30)=0
We add all the numbers together, and all the variables
(-1x+15)+20=0
We get rid of parentheses
-1x+15+20=0
We add all the numbers together, and all the variables
-1x+35=0
We move all terms containing x to the left, all other terms to the right
-x=-35
x=-35/-1
x=+35
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