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4x+30=-5x-15
We move all terms to the left:
4x+30-(-5x-15)=0
We get rid of parentheses
4x+5x+15+30=0
We add all the numbers together, and all the variables
9x+45=0
We move all terms containing x to the left, all other terms to the right
9x=-45
x=-45/9
x=-5
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