Question

12-7 21/29+х+4 23/29=12 2/29

Answer 1

$12-7 \frac{21}{29} +x+4 \frac{23}{29} =12 \frac{2}{29} \\ \\ 12+x=12 \frac{2}{29} -4 \frac{23}{29} +7 \frac{21}{29} \\ \\ 12+x=11 \frac{31}{29} -4 \frac{23}{29} +7 \frac{21}{29} \\ \\ 12+x=14 \frac{29}{29} \\ \\ 12+x=15\\x=15-12\\x=3$