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6(15+x)=75
We move all terms to the left:
6(15+x)-(75)=0
We add all the numbers together, and all the variables
6(x+15)-75=0
We multiply parentheses
6x+90-75=0
We add all the numbers together, and all the variables
6x+15=0
We move all terms containing x to the left, all other terms to the right
6x=-15
x=-15/6
x=-2+1/2
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