1.
21(18 + x) = 714
378 + 21х = 714
21х = 714 - 378
21х = 336
х = 336/21
х = 16
21(18 + 16) = 714
21 × 34 = 714
714 = 714
2.
16(4x - 34) = 608
64х - 544 = 608
64х = 608 + 544
64х = 1152
х = 1152/64
х = 18
16(4×18-34) = 608
16(72 - 34) = 608
1152 - 544 = 608
608 = 608
1.
21(18 + x) = 714
378 + 21х = 714
21х = 714 - 378
21х = 336
х = 336/21
х = 16
21(18 + 16) = 714
21 × 34 = 714
714 = 714
2.
16(4x - 34) = 608
64х - 544 = 608
64х = 608 + 544
64х = 1152
х = 1152/64
х = 18
16(4×18-34) = 608
16(72 - 34) = 608
1152 - 544 = 608
608 = 608