16х + 4/7 - 21 = 0
16х + 4/7 - 147/7 = 0
16х - 143/7 = 0
16х = 143/7
х = 143/7 : 16/1
х = 143/7 * 1/16 = 143/112 = 1 31/112
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16х + 4/7 - 21 = 0
16х + 4/7 - 147/7 = 0
16х - 143/7 = 0
16х = 143/7
х = 143/7 : 16/1
х = 143/7 * 1/16 = 143/112 = 1 31/112