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(1/4)*(10*x-7) = 8 // - 8
(1/4)*(10*x-7)-8 = 0
1/4*(10*x-7)-8 = 0
1/4*(10*x-7)-8 = 0
5/2*x-39/4 = 0
5/2*x-39/4 = 0
5/2*x-39/4 = 0 // + 39/4
5/2*x = 39/4 // : 5/2
x = 39/4/5/2
x = 39/10
x = 39/10
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