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(-2/3)*x = (1/2)*x-(7/2) // - (1/2)*x-(7/2)
(-2/3)*x-((1/2)*x)+7/2 = 0
(-2/3)*x+(-1/2)*x+7/2 = 0
7/2-7/6*x = 0 // - 7/2
-7/6*x = -7/2 // : -7/6
x = -7/2/(-7/6)
x = 3
x = 3
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