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(158-x)/7=20
We move all terms to the left:
(158-x)/7-(20)=0
We add all the numbers together, and all the variables
(-1x+158)/7-20=0
We multiply all the terms by the denominator
(-1x+158)-20*7=0
We add all the numbers together, and all the variables
(-1x+158)-140=0
We get rid of parentheses
-1x+158-140=0
We add all the numbers together, and all the variables
-1x+18=0
We move all terms containing x to the left, all other terms to the right
-x=-18
x=-18/-1
x=+18
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