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x in (-oo:+oo)
(1/4)*(x+9) = 7 // - 7
(1/4)*(x+9)-7 = 0
1/4*(x+9)-7 = 0
1/4*(x+9)-7 = 0
1/4*x-19/4 = 0
1/4*x-19/4 = 0
1/4*x-19/4 = 0 // + 19/4
1/4*x = 19/4 // : 1/4
x = 19/4/1/4
x = 19
x = 19
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