1 ) x - 37 = 648 : 54;
x - 37 = 12;
x = 12 + 37;
x = 49;
54 * (49 - 37) = 648;
648 = 648.
2) 1000 - x = 19 * 25;
1000 - x = 475;
x = 1000 - 475;
x = 525;
(1000 - 525) : 25 = 19;
19 = 19.
3) x - 59 = 598 : 46;
x - 59 = 13;
x = 13 + 59;
x = 72;
46 * (72 - 59) = 598;
598 = 598.
4) 1000 - x = 17 * 35;
1000 - x = 595;
x = 1000 - 595;
x = 405;
(1000 - 405) : 35 = 17;
17 = 17.
1 ) x - 37 = 648 : 54;
x - 37 = 12;
x = 12 + 37;
x = 49;
54 * (49 - 37) = 648;
648 = 648.
2) 1000 - x = 19 * 25;
1000 - x = 475;
x = 1000 - 475;
x = 525;
(1000 - 525) : 25 = 19;
19 = 19.
3) x - 59 = 598 : 46;
x - 59 = 13;
x = 13 + 59;
x = 72;
46 * (72 - 59) = 598;
598 = 598.
4) 1000 - x = 17 * 35;
1000 - x = 595;
x = 1000 - 595;
x = 405;
(1000 - 405) : 35 = 17;
17 = 17.