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-30-4x=15-x
We move all terms to the left:
-30-4x-(15-x)=0
We add all the numbers together, and all the variables
-4x-(-1x+15)-30=0
We get rid of parentheses
-4x+1x-15-30=0
We add all the numbers together, and all the variables
-3x-45=0
We move all terms containing x to the left, all other terms to the right
-3x=45
x=45/-3
x=-15
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