3*x-21=-x/2 - solution

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Solution for 3*x-21=-x/2 equation:

x in (-oo:+oo)

3*x-21 = -x/2 // + -x/2

3*x-(-x/2)-21 = 0

3*x+(1/2)*x-21 = 0

7/2*x-21 = 0 // + 21

7/2*x = 21 // : 7/2

x = 21/7/2

x = 6

x = 6

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