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x in (-oo:+oo)
1.5 = 7-(x/3.5) // - 7-(x/3.5)
x/3.5-7+1.5 = 0
0.28571429*x-5.5 = 0 // + 5.5
0.28571429*x = 5.5 // : 0.28571429
x = 5.5/0.28571429
x = 19.24999971
x = 19.24999971
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