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5-7x=6x-138
We move all terms to the left:
5-7x-(6x-138)=0
We get rid of parentheses
-7x-6x+138+5=0
We add all the numbers together, and all the variables
-13x+143=0
We move all terms containing x to the left, all other terms to the right
-13x=-143
x=-143/-13
x=+11
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