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(x-7x+4)+(x+8x-1)=0
We add all the numbers together, and all the variables
(-6x+4)+(9x-1)=0
We get rid of parentheses
-6x+9x+4-1=0
We add all the numbers together, and all the variables
3x+3=0
We move all terms containing x to the left, all other terms to the right
3x=-3
x=-3/3
x=-1
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