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x in (-oo:+oo)
-((21/2)*x)-35 = -100 // + 100
100-((21/2)*x)-35 = 0
(-21/2)*x-35+100 = 0
65-21/2*x = 0 // - 65
-21/2*x = -65 // : -21/2
x = -65/(-21/2)
x = 130/21
x = 130/21
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