(1-0.5)x=21

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Solution for (1-0.5)x=21 equation: 



(1-0.5)x=21

We move all terms to the left:

(1-0.5)x-(21)=0

We add all the numbers together, and all the variables

(0.5)x-21=0

We multiply parentheses

0.5x-21=0

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

0.5x=21

x=21/0.5

x=42

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