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x in (-oo:+oo)
x/4-1.3 = -0.05 // + 0.05
x/4-1.3+0.05 = 0
1/4*x-1.25 = 0 // + 1.25
1/4*x = 1.25 // : 1/4
x = 1.25/1/4
x = 5
x = 5
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