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18.4+28.5+17.6+0.3x=90
We move all terms to the left:
18.4+28.5+17.6+0.3x-(90)=0
We add all the numbers together, and all the variables
0.3x-25.5=0
We move all terms containing x to the left, all other terms to the right
0.3x=25.5
x=25.5/0.3
x=85
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