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20 = 5-((2/3)*x) // - 5-((2/3)*x)
(2/3)*x-5+20 = 0
2/3*x+15 = 0 // - 15
2/3*x = -15 // : 2/3
x = -15/2/3
x = -45/2
x = -45/2
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