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x in (-oo:+oo)
(-7/4)*x = -63/8 // + -63/8
(-7/4)*x-(-63/8) = 0
(-7/4)*x+63/8 = 0
63/8-7/4*x = 0 // - 63/8
-7/4*x = -63/8 // : -7/4
x = -63/8/(-7/4)
x = 9/2
x = 9/2
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