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X+X*1.19=1400
We move all terms to the left:
X+X*1.19-(1400)=0
Wy multiply elements
X+1.19X-1400=0
We add all the numbers together, and all the variables
2.19X-1400=0
We move all terms containing X to the left, all other terms to the right
2.19X=1400
X=1400/2.19
X=639+0.59000000000015/2.19
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