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7.5x+3(-15x+30/6)=15
We move all terms to the left:
7.5x+3(-15x+30/6)-(15)=0
We add all the numbers together, and all the variables
7.5x+3(-15x+5)-15=0
We multiply parentheses
7.5x-45x+15-15=0
We add all the numbers together, and all the variables
-37.5x=0
x=0/-37.5
x=0
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