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x in (-oo:+oo)
(-2/3)*(5*x+1) = -6 // + 6
(-2/3)*(5*x+1)+6 = 0
6-2/3*(5*x+1) = 0
6-2/3*(5*x+1) = 0
16/3-10/3*x = 0
16/3-10/3*x = 0
16/3-10/3*x = 0 // - 16/3
-10/3*x = -16/3 // : -10/3
x = -16/3/(-10/3)
x = 8/5
x = 8/5
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