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(4/5)*(15*x-5) = 12*x-4 // - 12*x-4
(4/5)*(15*x-5)-(12*x)+4 = 0
(4/5)*(15*x-5)-12*x+4 = 0
4/5*(15*x-5)-12*x+4 = 0
4/5*(15*x-5)-12*x+4 = 0
4-4 = 0
0 = 0
0 = 0
x belongs to the empty set
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