-3x+9+4x=15

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Solution for -3x+9+4x=15 equation: 


x in (-oo:+oo)

4*x-3*x+9 = 15 // - 15

4*x-3*x-15+9 = 0

x-6 = 0 // + 6

x = 6

x = 6

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