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x in (-oo:+oo)
x/7-4+4 = 15-4 // - 15-4
x/7-15-4+4+4 = 0
1/7*x-11 = 0 // + 11
1/7*x = 11 // : 1/7
x = 11/1/7
x = 77
x = 77
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