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0.12x+0.32(4-x)=0.2(4)
We move all terms to the left:
0.12x+0.32(4-x)-(0.2(4))=0
We add all the numbers together, and all the variables
0.12x+0.32(-1x+4)-(0.24)=0
We add all the numbers together, and all the variables
0.12x+0.32(-1x+4)-0.24=0
We multiply parentheses
0.12x-0.32x+1.28-0.24=0
We add all the numbers together, and all the variables
-0.2x+1.04=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-1.04
x=-1.04/-0.2
x=5+0.04/0.2
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