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x*1.4=3999
We move all terms to the left:
x*1.4-(3999)=0
Wy multiply elements
1.4x-3999=0
We move all terms containing x to the left, all other terms to the right
1.4x=3999
x=3999/1.4
x=2856+0.60000000000036/1.4
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