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13-((3/2)*x) = 12 // - 12
13-((3/2)*x)-12 = 0
(-3/2)*x-12+13 = 0
1-3/2*x = 0 // - 1
-3/2*x = -1 // : -3/2
x = -1/(-3/2)
x = 2/3
x = 2/3
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