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x in (-oo:+oo)
2*x+1/0.7 = -3 // + 3
2*x+1/0.7+3 = 0
2*x+4.42857143 = 0 // - 4.42857143
2*x = -4.42857143 // : 2
x = -4.42857143/2
x = -2.21428572
x = -2.21428572
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