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150=15x+3
We move all terms to the left:
150-(15x+3)=0
We get rid of parentheses
-15x-3+150=0
We add all the numbers together, and all the variables
-15x+147=0
We move all terms containing x to the left, all other terms to the right
-15x=-147
x=-147/-15
x=9+4/5
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