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x in (-oo:+oo)
(-7/8)*x+13/4 = 13 // - 13
(-7/8)*x+13/4-13 = 0
-7/8*x-39/4 = 0 // + 39/4
-7/8*x = 39/4 // : -7/8
x = 39/4/(-7/8)
x = -78/7
x = -78/7
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