1+3x+7x=91

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Solution for 1+3x+7x=91 equation: 


x in (-oo:+oo)

3*x+7*x+1 = 91 // - 91

3*x+7*x-91+1 = 0

10*x-90 = 0 // + 90

10*x = 90 // : 10

x = 90/10

x = 9

x = 9

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