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-15=4x-8x+30x
We move all terms to the left:
-15-(4x-8x+30x)=0
We add all the numbers together, and all the variables
-(+26x)-15=0
We get rid of parentheses
-26x-15=0
We move all terms containing x to the left, all other terms to the right
-26x=15
x=15/-26
x=-15/26
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