-4a+9=7a-90

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Solution for -4a+9=7a-90 equation: 


a in (-oo:+oo)

9-4*a = 7*a-90 // - 7*a-90

9-4*a-(7*a)+90 = 0

9-4*a-7*a+90 = 0

99-11*a = 0 // - 99

-11*a = -99 // : -11

a = -99/(-11)

a = 9

a = 9

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