21=1/3(3-4x)

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Solution for 21=1/3(3-4x) equation: 


x in (-oo:+oo)

21 = (1/3)*(3-(4*x)) // - (1/3)*(3-(4*x))

21-((1/3)*(3-(4*x))) = 0

(-1/3)*(3-4*x)+21 = 0

21-1/3*(3-4*x) = 0

21-1/3*(3-4*x) = 0

4/3*x+20 = 0

4/3*x+20 = 0

4/3*x+20 = 0 // - 20

4/3*x = -20 // : 4/3

x = -20/4/3

x = -15

x = -15

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