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X+4X(5.7)=42
We move all terms to the left:
X+4X(5.7)-(42)=0
We multiply parentheses
X+22.8X-42=0
We add all the numbers together, and all the variables
23.8X-42=0
We move all terms containing X to the left, all other terms to the right
23.8X=42
X=42/23.8
X=1+15.166666666667/19.833333333333
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