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x in (-oo:+oo)
(-1/3)*(x-7) = 4 // - 4
(-1/3)*(x-7)-4 = 0
-1/3*(x-7)-4 = 0
-1/3*(x-7)-4 = 0
-1/3*x-5/3 = 0
-1/3*x-5/3 = 0
-1/3*x-5/3 = 0 // + 5/3
-1/3*x = 5/3 // : -1/3
x = 5/3/(-1/3)
x = -5
x = -5
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