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X(.06)+X(.08)=140
We move all terms to the left:
X(.06)+X(.08)-(140)=0
We add all the numbers together, and all the variables
X(0.06)+X(0.08)-140=0
We multiply parentheses
0.06X+0.08X-140=0
We add all the numbers together, and all the variables
0.14X-140=0
We move all terms containing X to the left, all other terms to the right
0.14X=140
X=140/0.14
X=999+0.14/0.14
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