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137=4x+9
We move all terms to the left:
137-(4x+9)=0
We get rid of parentheses
-4x-9+137=0
We add all the numbers together, and all the variables
-4x+128=0
We move all terms containing x to the left, all other terms to the right
-4x=-128
x=-128/-4
x=+32
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