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x in (-oo:+oo)
(-2/3)*x-10 = -x-9 // + -x-9
(-2/3)*x+x-10+9 = 0
1/3*x-1 = 0 // + 1
1/3*x = 1 // : 1/3
x = 1/1/3
x = 3
x = 3
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