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(1/4)*(10*x-8) = 7 // - 7
(1/4)*(10*x-8)-7 = 0
1/4*(10*x-8)-7 = 0
1/4*(10*x-8)-7 = 0
5/2*x-9 = 0
5/2*x-9 = 0
5/2*x-9 = 0 // + 9
5/2*x = 9 // : 5/2
x = 9/5/2
x = 18/5
x = 18/5
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