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-9x+40=-4x+90
We move all terms to the left:
-9x+40-(-4x+90)=0
We get rid of parentheses
-9x+4x-90+40=0
We add all the numbers together, and all the variables
-5x-50=0
We move all terms containing x to the left, all other terms to the right
-5x=50
x=50/-5
x=-10
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