3x+(-4x+21)=7

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Solution for 3x+(-4x+21)=7 equation: 



3x+(-4x+21)=7

We move all terms to the left:

3x+(-4x+21)-(7)=0

We get rid of parentheses

3x-4x+21-7=0

We add all the numbers together, and all the variables

-1x+14=0

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

-x=-14

x=-14/-1

x=+14

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