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x in (-oo:+oo)
(-1/3)*x-5 = 7-x // - 7-x
(-1/3)*x+x-7-5 = 0
2/3*x-12 = 0 // + 12
2/3*x = 12 // : 2/3
x = 12/2/3
x = 18
x = 18
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