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3*m-((2*x)/21) = 0
3*m+(-2/21)*x = 0
3*m-2/21*x = 0 // - 3*m
-2/21*x = -(3*m) // : -2/21
x = (-(3*m))/(-2/21)
x = 63/2*m
x = 63/2*m
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