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x-x*0.3=80
We move all terms to the left:
x-x*0.3-(80)=0
Wy multiply elements
x-0.3x-80=0
We add all the numbers together, and all the variables
0.7x-80=0
We move all terms containing x to the left, all other terms to the right
0.7x=80
x=80/0.7
x=114+0.2/0.7
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