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x in (-oo:+oo)
(x-63)/7 = 100 // - 100
(x-63)/7-100 = 0
(x-63)/7+(-100*7)/7 = 0
x-100*7-63 = 0
x-763 = 0
(x-763)/7 = 0
(x-763)/7 = 0 // * 7
x-763 = 0
x-763 = 0 // + 763
x = 763
x = 763
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