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100-5x=40+10x
We move all terms to the left:
100-5x-(40+10x)=0
We add all the numbers together, and all the variables
-5x-(10x+40)+100=0
We get rid of parentheses
-5x-10x-40+100=0
We add all the numbers together, and all the variables
-15x+60=0
We move all terms containing x to the left, all other terms to the right
-15x=-60
x=-60/-15
x=+4
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