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(1/4)*(10*x-7) = 3 // - 3
(1/4)*(10*x-7)-3 = 0
1/4*(10*x-7)-3 = 0
1/4*(10*x-7)-3 = 0
5/2*x-19/4 = 0
5/2*x-19/4 = 0
5/2*x-19/4 = 0 // + 19/4
5/2*x = 19/4 // : 5/2
x = 19/4/5/2
x = 19/10
x = 19/10
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