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x in (-oo:+oo)
(3/8)*(-x-3) = 7 // - 7
(3/8)*(-x-3)-7 = 0
3/8*(-x-3)-7 = 0
3/8*(-x-3)-7 = 0
-3/8*x-65/8 = 0
-3/8*x-65/8 = 0
-3/8*x-65/8 = 0 // + 65/8
-3/8*x = 65/8 // : -3/8
x = 65/8/(-3/8)
x = -65/3
x = -65/3
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