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(1/4)*(10*x-9) = 4 // - 4
(1/4)*(10*x-9)-4 = 0
1/4*(10*x-9)-4 = 0
1/4*(10*x-9)-4 = 0
5/2*x-25/4 = 0
5/2*x-25/4 = 0
5/2*x-25/4 = 0 // + 25/4
5/2*x = 25/4 // : 5/2
x = 25/4/5/2
x = 5/2
x = 5/2
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