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x in (-oo:+oo)
T = (700/4)*x-20 // - (700/4)*x-20
T-((700/4)*x)+20 = 0
T-175*x+20 = 0
T-175*x+20 = 0 // - T+20
-175*x = -(T+20) // : -175
x = (-(T+20))/(-175)
x = (T+20)/175
x = (T+20)/175
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