7+5a+4a=70

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Solution for 7+5a+4a=70 equation: 


a in (-oo:+oo)

5*a+4*a+7 = 70 // - 70

5*a+4*a-70+7 = 0

9*a-63 = 0 // + 63

9*a = 63 // : 9

a = 63/9

a = 7

a = 7

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