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x in (-oo:+oo)
x/3-2.1 = -6.9 // + 6.9
x/3-2.1+6.9 = 0
1/3*x+4.8 = 0 // - 4.8
1/3*x = -4.8 // : 1/3
x = -4.8/1/3
x = -14.40000014
x = -14.40000014
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