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15(x+3)=30x
We move all terms to the left:
15(x+3)-(30x)=0
We add all the numbers together, and all the variables
-30x+15(x+3)=0
We multiply parentheses
-30x+15x+45=0
We add all the numbers together, and all the variables
-15x+45=0
We move all terms containing x to the left, all other terms to the right
-15x=-45
x=-45/-15
x=+3
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