40x-4x-21=4-20x-40

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Solution for 40x-4x-21=4-20x-40 equation: 



40x-4x-21=4-20x-40

We move all terms to the left:

40x-4x-21-(4-20x-40)=0

We add all the numbers together, and all the variables

40x-4x-(-20x-36)-21=0

We add all the numbers together, and all the variables

36x-(-20x-36)-21=0

We get rid of parentheses

36x+20x+36-21=0

We add all the numbers together, and all the variables

56x+15=0

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

56x=-15

x=-15/56

x=-15/56

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