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x in (-oo:+oo)
(1*x)/4 = 15 // - 15
(1*x)/4-15 = 0
x/4-15 = 0
1/4*x-15 = 0 // + 15
1/4*x = 15 // : 1/4
x = 15/1/4
x = 60
x = 60
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