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-x+6x=70+4x-90
We move all terms to the left:
-x+6x-(70+4x-90)=0
We add all the numbers together, and all the variables
-x+6x-(4x-20)=0
We add all the numbers together, and all the variables
5x-(4x-20)=0
We get rid of parentheses
5x-4x+20=0
We add all the numbers together, and all the variables
x+20=0
We move all terms containing x to the left, all other terms to the right
x=-20
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