x-55+3x=21

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Solution for x-55+3x=21 equation: 



x-55+3x=21

We move all terms to the left:

x-55+3x-(21)=0

We add all the numbers together, and all the variables

4x-76=0

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

4x=76

x=76/4

x=19

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