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x in (-oo:+oo)
(1/4)*(x+4) = 15 // - 15
(1/4)*(x+4)-15 = 0
1/4*(x+4)-15 = 0
1/4*(x+4)-15 = 0
1/4*x-14 = 0
1/4*x-14 = 0
1/4*x-14 = 0 // + 14
1/4*x = 14 // : 1/4
x = 14/1/4
x = 56
x = 56
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