-420=-4(10x+5)

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Solution for -420=-4(10x+5) equation: 



-420=-4(10x+5)

We move all terms to the left:

-420-(-4(10x+5))=0



We calculate terms in parentheses: -(-4(10x+5)), so:

-4(10x+5)

We multiply parentheses

-40x-20

Back to the equation:

-(-40x-20)



We get rid of parentheses

40x+20-420=0

We add all the numbers together, and all the variables

40x-400=0

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

40x=400

x=400/40

x=10

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