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

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Solution for (21-2x)-(5-4x)=0 equation: 



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

We add all the numbers together, and all the variables

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

We get rid of parentheses

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

We add all the numbers together, and all the variables

2x+16=0

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

2x=-16

x=-16/2

x=-8

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