21*3x=-15

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Solution for 21*3x=-15 equation: 



21*3x=-15

We move all terms to the left:

21*3x-(-15)=0

We add all the numbers together, and all the variables

21*3x+15=0

Wy multiply elements

63x+15=0

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

63x=-15

x=-15/63

x=-5/21

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