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

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


x in (-oo:+oo)

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

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

8*x-4*x+21/7 = 0

4*x+3 = 0 // - 3

4*x = -3 // : 4

x = -3/4

x = -3/4

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