(3x-9/7x+21)*(4x+12/14x-42)

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Solution for (3x-9/7x+21)*(4x+12/14x-42) equation: 


x in (-oo:+oo)

(3*x-((9/7)*x)+21)*(4*x+(12/14)*x-42) = 0

(3*x+(-9/7)*x+21)*(4*x+(12/14)*x-42) = 0

(12/7*x+21)*(34/7*x-42) = 0

( 12/7*x+21 )

12/7*x+21 = 0 // - 21

12/7*x = -21 // : 12/7

x = -21/12/7

x = -49/4

( 34/7*x-42 )

34/7*x-42 = 0 // + 42

34/7*x = 42 // : 34/7

x = 42/34/7

x = 147/17

x in { -49/4, 147/17 }

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