4=21/2x-12

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Solution for 4=21/2x-12 equation: 


x in (-oo:+oo)

4 = (21/2)*x-12 // - (21/2)*x-12

4-((21/2)*x)+12 = 0

(-21/2)*x+4+12 = 0

16-21/2*x = 0 // - 16

-21/2*x = -16 // : -21/2

x = -16/(-21/2)

x = 32/21

x = 32/21

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