13=2a-4a+7

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Solution for 13=2a-4a+7 equation: 


a in (-oo:+oo)

13 = 2*a-(4*a)+7 // - 2*a-(4*a)+7

4*a-(2*a)-7+13 = 0

4*a-2*a-7+13 = 0

2*a+6 = 0 // - 6

2*a = -6 // : 2

a = -6/2

a = -3

a = -3

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