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4-((5/3)*x)+7 = 4 // - 4
4-((5/3)*x)-4+7 = 0
(-5/3)*x-4+4+7 = 0
7-5/3*x = 0 // - 7
-5/3*x = -7 // : -5/3
x = -7/(-5/3)
x = 21/5
x = 21/5
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