8=4.2x+15

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Solution for 8=4.2x+15 equation: 



8=4.2x+15

We move all terms to the left:

8-(4.2x+15)=0

We get rid of parentheses

-4.2x-15+8=0

We add all the numbers together, and all the variables

-4.2x-7=0

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

-4.2x=7

x=7/-4.2

x=-1+1/1.5

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