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(5/4)*(4*x-8) = -30 // + 30
(5/4)*(4*x-8)+30 = 0
5/4*(4*x-8)+30 = 0
5/4*(4*x-8)+30 = 0
5*x+20 = 0
5*x+20 = 0
5*x+20 = 0 // - 20
5*x = -20 // : 5
x = -20/5
x = -4
x = -4
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