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x in (-oo:+oo)
x/20+53/20 = 7 // - 7
x/20+53/20-7 = 0
1/20*x-87/20 = 0 // + 87/20
1/20*x = 87/20 // : 1/20
x = 87/20/1/20
x = 87
x = 87
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