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0.9(x-4)=31.5
We move all terms to the left:
0.9(x-4)-(31.5)=0
We add all the numbers together, and all the variables
0.9(x-4)-31.5=0
We multiply parentheses
0.9x-3.6-31.5=0
We add all the numbers together, and all the variables
0.9x-35.1=0
We move all terms containing x to the left, all other terms to the right
0.9x=35.1
x=35.1/0.9
x=39
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