2/3x-1/3x=-21

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Solution for 2/3x-1/3x=-21 equation: 


x in (-oo:+oo)

(2/3)*x-((1/3)*x) = -21 // + 21

(2/3)*x-((1/3)*x)+21 = 0

(2/3)*x+(-1/3)*x+21 = 0

1/3*x+21 = 0 // - 21

1/3*x = -21 // : 1/3

x = -21/1/3

x = -63

x = -63

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