2x-3+6x+21=0

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Solution for 2x-3+6x+21=0 equation: 



2x-3+6x+21=0

We add all the numbers together, and all the variables

8x+18=0

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

8x=-18

x=-18/8

x=-2+1/4

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