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x in (-oo:+oo)
7 = (4/3)*(x+15) // - (4/3)*(x+15)
7-((4/3)*(x+15)) = 0
(-4/3)*(x+15)+7 = 0
7-4/3*(x+15) = 0
7-4/3*(x+15) = 0
-4/3*x-13 = 0
-4/3*x-13 = 0
-4/3*x-13 = 0 // + 13
-4/3*x = 13 // : -4/3
x = 13/(-4/3)
x = -39/4
x = -39/4
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