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4 = (21/2)*x-12 // - (21/2)*x-12
4-((21/2)*x)+12 = 0
(-21/2)*x+4+12 = 0
16-21/2*x = 0 // - 16
-21/2*x = -16 // : -21/2
x = -16/(-21/2)
x = 32/21
x = 32/21
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