х + 1 = 10
х = 10 - 1
х = 9
10х + 7 = 57
10х = 57 - 7
10х = 50
х = 50 / 10
х = 5
63/х - 20 = -13
63/х = -13 + 20
63/х = 7
х = 63/7
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х + 1 = 10
х = 10 - 1
х = 9
10х + 7 = 57
10х = 57 - 7
10х = 50
х = 50 / 10
х = 5
63/х - 20 = -13
63/х = -13 + 20
63/х = 7
х = 63/7
х = 9