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3-(7/3) = (7/2)*x // - (7/2)*x
3-((7/2)*x)-(7/3) = 0
(-7/2)*x-7/3+3 = 0
2/3-7/2*x = 0 // - 2/3
-7/2*x = -2/3 // : -7/2
x = -2/3/(-7/2)
x = 4/21
x = 4/21
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