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3 = (18/3)*x-4 // - (18/3)*x-4
3-((18/3)*x)+4 = 0
3-6*x+4 = 0
7-6*x = 0 // - 7
-6*x = -7 // : -6
x = -7/(-6)
x = 7/6
x = 7/6
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