51+8x+7x=21

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Solution for 51+8x+7x=21 equation: 



51+8x+7x=21

We move all terms to the left:

51+8x+7x-(21)=0

We add all the numbers together, and all the variables

15x+30=0

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

15x=-30

x=-30/15

x=-2

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