7/15=21/3x-4

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Solution for 7/15=21/3x-4 equation: 


x in (-oo:+oo)

7/15 = (21/3)*x-4 // - (21/3)*x-4

7/15-((21/3)*x)+4 = 0

7/15-7*x+4 = 0

67/15-7*x = 0 // - 67/15

-7*x = -67/15 // : -7

x = -67/15/(-7)

x = 67/105

x = 67/105

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