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137-20x=4x-151
We move all terms to the left:
137-20x-(4x-151)=0
We get rid of parentheses
-20x-4x+151+137=0
We add all the numbers together, and all the variables
-24x+288=0
We move all terms containing x to the left, all other terms to the right
-24x=-288
x=-288/-24
x=+12
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