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(2/3)*x+7 = (4/3)*x-8 // - (4/3)*x-8
(2/3)*x-((4/3)*x)+7+8 = 0
(2/3)*x+(-4/3)*x+7+8 = 0
15-2/3*x = 0 // - 15
-2/3*x = -15 // : -2/3
x = -15/(-2/3)
x = 45/2
x = 45/2
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