x*0.7=21

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Solution for x*0.7=21 equation: 



x*0.7=21

We move all terms to the left:

x*0.7-(21)=0

Wy multiply elements

0.7x-21=0

We move all terms containing x to the left, all other terms to the right

0.7x=21

x=21/0.7

x=30

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