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(13x+3)+(13x+3)=30x-2
We move all terms to the left:
(13x+3)+(13x+3)-(30x-2)=0
We get rid of parentheses
13x+13x-30x+3+3+2=0
We add all the numbers together, and all the variables
-4x+8=0
We move all terms containing x to the left, all other terms to the right
-4x=-8
x=-8/-4
x=+2
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