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15x+30=16x-3
We move all terms to the left:
15x+30-(16x-3)=0
We get rid of parentheses
15x-16x+3+30=0
We add all the numbers together, and all the variables
-1x+33=0
We move all terms containing x to the left, all other terms to the right
-x=-33
x=-33/-1
x=+33
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