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x in (-oo:+oo)
1.25 = (x/30-0.5)/3.5 // - (x/30-0.5)/3.5
1.25-((x/30-0.5)/3.5) = 0
1.25-0.28571429*(x/30-0.5) = 0
1.25-0.28571429*(1/30*x-0.5) = 0
1.25-0.28571429*(1/30*x-0.5) = 0
1.392857145-0.0095238087142857*x = 0
1.392857145-0.0095238087142857*x = 0
1.392857145-0.0095238087142857*x = 0 // - 1.392857145
-0.0095238087142857*x = -1.392857145 // : -0.0095238087142857
x = -1.392857145/(-0.0095238087142857)
x = 146.25001266
x = 146.25001266
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