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x in (-oo:+oo)
(1/5)*(2*x-5) = 7 // - 7
(1/5)*(2*x-5)-7 = 0
1/5*(2*x-5)-7 = 0
1/5*(2*x-5)-7 = 0
2/5*x-8 = 0
2/5*x-8 = 0
2/5*x-8 = 0 // + 8
2/5*x = 8 // : 2/5
x = 8/2/5
x = 20
x = 20
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