28=-5a+2a+7

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Solution for 28=-5a+2a+7 equation: 


a in (-oo:+oo)

28 = 2*a-5*a+7 // - 2*a-5*a+7

28-(-5*a)-(2*a)-7 = 0

5*a-2*a-7+28 = 0

3*a+21 = 0 // - 21

3*a = -21 // : 3

a = -21/3

a = -7

a = -7

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