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x(.30)=210
We move all terms to the left:
x(.30)-(210)=0
We add all the numbers together, and all the variables
x(0.3)-210=0
We multiply parentheses
0.3x-210=0
We move all terms containing x to the left, all other terms to the right
0.3x=210
x=210/0.3
x=700
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