X+x(0.5)=400

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Solution for X+x(0.5)=400 equation:



X+X(0.5)=400
We move all terms to the left:
X+X(0.5)-(400)=0
We multiply parentheses
X+0.5X-400=0
We add all the numbers together, and all the variables
1.5X-400=0
We move all terms containing X to the left, all other terms to the right
1.5X=400
X=400/1.5
X=266+1/1.5

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