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(15-20x)/5=7
We move all terms to the left:
(15-20x)/5-(7)=0
We add all the numbers together, and all the variables
(-20x+15)/5-7=0
We multiply all the terms by the denominator
(-20x+15)-7*5=0
We add all the numbers together, and all the variables
(-20x+15)-35=0
We get rid of parentheses
-20x+15-35=0
We add all the numbers together, and all the variables
-20x-20=0
We move all terms containing x to the left, all other terms to the right
-20x=20
x=20/-20
x=-1
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