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20=15x-40/7
We move all terms to the left:
20-(15x-40/7)=0
We add all the numbers together, and all the variables
-(+15x-40/7)+20=0
We get rid of parentheses
-15x+20+40/7=0
We multiply all the terms by the denominator
-15x*7+40+20*7=0
We add all the numbers together, and all the variables
-15x*7+180=0
Wy multiply elements
-105x+180=0
We move all terms containing x to the left, all other terms to the right
-105x=-180
x=-180/-105
x=1+5/7
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