45=3x+x+9

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Solution for 45=3x+x+9 equation: 


x in (-oo:+oo)

45 = 3*x+x+9 // - 3*x+x+9

45-(3*x)-x-9 = 0

45-3*x-x-9 = 0

36-4*x = 0 // - 36

-4*x = -36 // : -4

x = -36/(-4)

x = 9

x = 9

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