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(-2/3)*x-(21/4) = 27/4 // - 27/4
(-2/3)*x-(21/4)-(27/4) = 0
(-2/3)*x-21/4-27/4 = 0
-2/3*x-12 = 0 // + 12
-2/3*x = 12 // : -2/3
x = 12/(-2/3)
x = -18
x = -18
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