150=21+0.30x

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Solution for 150=21+0.30x equation: 



150=21+0.30x

We move all terms to the left:

150-(21+0.30x)=0

We add all the numbers together, and all the variables

-(0.30x+21)+150=0

We get rid of parentheses

-0.30x-21+150=0

We add all the numbers together, and all the variables

-0.3x+129=0

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

-0.3x=-129

x=-129/-0.3

x=+430

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