4x-9=-2x+21 - solution

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Solution for 4x-9=-2x+21 equation:

x in (-oo:+oo)

4*x-9 = 21-2*x // - 21-2*x

4*x-(-2*x)-21-9 = 0

4*x+2*x-21-9 = 0

6*x-30 = 0 // + 30

6*x = 30 // : 6

x = 30/6

x = 5

x = 5

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