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x in (-oo:+oo)
-7*x-(5/3) = 4 // - 4
-7*x-(5/3)-4 = 0
-7*x-5/3-4 = 0
-7*x-17/3 = 0 // + 17/3
-7*x = 17/3 // : -7
x = 17/3/(-7)
x = -17/21
x = -17/21
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