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