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0 = (4/3)*x-20 // - (4/3)*x-20
0-((4/3)*x)+20 = 0
(-4/3)*x+0+20 = 0
20-4/3*x = 0 // - 20
-4/3*x = -20 // : -4/3
x = -20/(-4/3)
x = 15
x = 15
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