u-20u+21=-4(u+42)

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Solution for u-20u+21=-4(u+42) equation: 



u-20u+21=-4(u+42)

We move all terms to the left:

u-20u+21-(-4(u+42))=0

We add all the numbers together, and all the variables

-19u-(-4(u+42))+21=0



We calculate terms in parentheses: -(-4(u+42)), so:

-4(u+42)

We multiply parentheses

-4u-168

Back to the equation:

-(-4u-168)



We get rid of parentheses

-19u+4u+168+21=0

We add all the numbers together, and all the variables

-15u+189=0

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

-15u=-189

u=-189/-15

u=12+3/5

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