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x in (-oo:+oo)
(-4/3)*(x+12)+(1/3)*x = -6 // + 6
(-4/3)*(x+12)+(1/3)*x+6 = 0
x/3-4/3*(x+12)+6 = 0
(-4/3*3*(x+12))/3+x/3+(3*6)/3 = 0
x-4/3*3*(x+12)+3*6 = 0
18-3*x-48 = 0
-3*x-30 = 0
(-3*x-30)/3 = 0
(-3*x-30)/3 = 0 // * 3
-3*x-30 = 0
-3*x-30 = 0 // + 30
-3*x = 30 // : -3
x = 30/(-3)
x = -10
x = -10
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