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x in (-oo:+oo)
(-5/3)*(x+6)+(2/3)*x = -8 // + 8
(-5/3)*(x+6)+(2/3)*x+8 = 0
(2*x)/3-5/3*(x+6)+8 = 0
(-5/3*3*(x+6))/3+(2*x)/3+(3*8)/3 = 0
2*x-5/3*3*(x+6)+3*8 = 0
24-3*x-30 = 0
-3*x-6 = 0
(-3*x-6)/3 = 0
(-3*x-6)/3 = 0 // * 3
-3*x-6 = 0
-3*x-6 = 0 // + 6
-3*x = 6 // : -3
x = 6/(-3)
x = -2
x = -2
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