-21/7=-7x

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Solution for -21/7=-7x equation: 


x in (-oo:+oo)

-21/7 = -7*x // + -7*x

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

7*x-21/7 = 0

7*x-3 = 0 // + 3

7*x = 3 // : 7

x = 3/7

x = 3/7

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