9/10+7a+3a=409/10

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Solution for 9/10+7a+3a=409/10 equation: 


a in (-oo:+oo)

7*a+3*a+9/10 = 409/10 // - 409/10

7*a+3*a+9/10-(409/10) = 0

7*a+3*a+9/10-409/10 = 0

10*a-40 = 0 // + 40

10*a = 40 // : 10

a = 40/10

a = 4

a = 4

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