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0.5x+0.2(9-x)=3
We move all terms to the left:
0.5x+0.2(9-x)-(3)=0
We add all the numbers together, and all the variables
0.5x+0.2(-1x+9)-3=0
We multiply parentheses
0.5x-0.2x+1.8-3=0
We add all the numbers together, and all the variables
0.3x-1.2=0
We move all terms containing x to the left, all other terms to the right
0.3x=1.2
x=1.2/0.3
x=4
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