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