(х - 63) + 105 = 175
х - 63 = 175 - 105
х - 63 = 70
х = 70 + 63
х = 133
(133 - 63) + 105 = 175
70 + 105 = 175
175 = 175
(х - 63) + 105 = 175
х - 63 = 175 - 105
х - 63 = 70
х = 70 + 63
х = 133
(133 - 63) + 105 = 175
70 + 105 = 175
175 = 175