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15 = (5/3)*x-10 // - (5/3)*x-10
10-((5/3)*x)+15 = 0
(-5/3)*x+10+15 = 0
25-5/3*x = 0 // - 25
-5/3*x = -25 // : -5/3
x = -25/(-5/3)
x = 15
x = 15
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