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0.3(90+x)=72
We move all terms to the left:
0.3(90+x)-(72)=0
We add all the numbers together, and all the variables
0.3(x+90)-72=0
We multiply parentheses
0.3x+27-72=0
We add all the numbers together, and all the variables
0.3x-45=0
We move all terms containing x to the left, all other terms to the right
0.3x=45
x=45/0.3
x=150
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