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