21=(-3.5)x

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Solution for 21=(-3.5)x equation: 



21=(-3.5)x

We move all terms to the left:

21-((-3.5)x)=0



We calculate terms in parentheses: -((-3.5)x), so:

(-3.5)x

We multiply parentheses

-3.5x

Back to the equation:

-(-3.5x)



We get rid of parentheses

3.5x+21=0

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

3.5x=-21

x=-21/3.5

x=-6

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