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15-x=40-6x
We move all terms to the left:
15-x-(40-6x)=0
We add all the numbers together, and all the variables
-x-(-6x+40)+15=0
We add all the numbers together, and all the variables
-1x-(-6x+40)+15=0
We get rid of parentheses
-1x+6x-40+15=0
We add all the numbers together, and all the variables
5x-25=0
We move all terms containing x to the left, all other terms to the right
5x=25
x=25/5
x=5
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