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x in (-oo:+oo)
7*(8-(x/4)) = 77 // - 77
7*(8-(x/4))-77 = 0
7*(8-1/4*x)-77 = 0
7*(8-1/4*x)-77 = 0
-7/4*x-21 = 0
-7/4*x-21 = 0
-7/4*x-21 = 0 // + 21
-7/4*x = 21 // : -7/4
x = 21/(-7/4)
x = -12
x = -12
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