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3 = (10/3)*x-12 // - (10/3)*x-12
3-((10/3)*x)+12 = 0
(-10/3)*x+3+12 = 0
15-10/3*x = 0 // - 15
-10/3*x = -15 // : -10/3
x = -15/(-10/3)
x = 9/2
x = 9/2
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