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x+(x*0.4)=140
We move all terms to the left:
x+(x*0.4)-(140)=0
We add all the numbers together, and all the variables
x+(+x*0.4)-140=0
We get rid of parentheses
x+x*0.4-140=0
Wy multiply elements
x+0.4x-140=0
We add all the numbers together, and all the variables
1.4x-140=0
We move all terms containing x to the left, all other terms to the right
1.4x=140
x=140/1.4
x=100
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