7a-4+2a=77

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Solution for 7a-4+2a=77 equation: 


a in (-oo:+oo)

7*a+2*a-4 = 77 // - 77

7*a+2*a-77-4 = 0

9*a-81 = 0 // + 81

9*a = 81 // : 9

a = 81/9

a = 9

a = 9

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