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(-3/4)*((4/5)*x-1) = 27/125 // - 27/125
(-3/4)*((4/5)*x-1)-(27/125) = 0
(-3/4)*((4/5)*x-1)-27/125 = 0
-3/4*(4/5*x-1)-27/125 = 0
(-3/4*125*(4/5*x-1))/125-27/125 = 0
-3/4*125*(4/5*x-1)-27 = 0
267/4-75*x = 0
(267/4-75*x)/125 = 0
(267/4-75*x)/125 = 0 // * 125
267/4-75*x = 0
267/4-75*x = 0 // - 267/4
-75*x = -267/4 // : -75
x = -267/4/(-75)
x = 89/100
x = 89/100
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