21-2X/4

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Solution for 21-2X/4 equation: 


X in (-oo:+oo)

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

(-1/2)*X+21 = 0

21-1/2*X = 0 // - 21

-1/2*X = -21 // : -1/2

X = -21/(-1/2)

X = 42

X = 42

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