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-15+4x=-30+x
We move all terms to the left:
-15+4x-(-30+x)=0
We add all the numbers together, and all the variables
4x-(x-30)-15=0
We get rid of parentheses
4x-x+30-15=0
We add all the numbers together, and all the variables
3x+15=0
We move all terms containing x to the left, all other terms to the right
3x=-15
x=-15/3
x=-5
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