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12*x-(1/2) = 7-((19/9)*x) // - 7-((19/9)*x)
12*x+(19/9)*x-(1/2)-7 = 0
12*x+(19/9)*x-1/2-7 = 0
127/9*x-15/2 = 0 // + 15/2
127/9*x = 15/2 // : 127/9
x = 15/2/127/9
x = 135/254
x = 135/254
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