21=-4(x-2)+5

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Solution for 21=-4(x-2)+5 equation: 



21=-4(x-2)+5

We move all terms to the left:

21-(-4(x-2)+5)=0



We calculate terms in parentheses: -(-4(x-2)+5), so:

-4(x-2)+5

We multiply parentheses

-4x+8+5

We add all the numbers together, and all the variables

-4x+13

Back to the equation:

-(-4x+13)



We get rid of parentheses

4x-13+21=0

We add all the numbers together, and all the variables

4x+8=0

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

4x=-8

x=-8/4

x=-2

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