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40x/20=9x+x-7
We move all terms to the left:
40x/20-(9x+x-7)=0
We add all the numbers together, and all the variables
40x/20-(10x-7)=0
We get rid of parentheses
40x/20-10x+7=0
We multiply all the terms by the denominator
40x-10x*20+7*20=0
We add all the numbers together, and all the variables
40x-10x*20+140=0
Wy multiply elements
40x-200x+140=0
We add all the numbers together, and all the variables
-160x+140=0
We move all terms containing x to the left, all other terms to the right
-160x=-140
x=-140/-160
x=7/8
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