15=2a-4a+7

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Solution for 15=2a-4a+7 equation: 


a in (-oo:+oo)

15 = 2*a-(4*a)+7 // - 2*a-(4*a)+7

4*a-(2*a)-7+15 = 0

4*a-2*a-7+15 = 0

2*a+8 = 0 // - 8

2*a = -8 // : 2

a = -8/2

a = -4

a = -4

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