21/7=4X+2(-7x)

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Solution for 21/7=4X+2(-7x) equation: 


x in (-oo:+oo)

21/7 = 4*X-7*2*x // - 4*X-7*2*x

21/7-(4*X)-(-7*2*x) = 0

14*x-4*X+21/7 = 0

14*x-4*X+3 = 0 // - 3-4*X

14*x = -(3-4*X) // : 14

x = (-(3-4*X))/14

x = (-(3-4*X))/14

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