Вправи 601 - 750 » 734

а) х + 2х = 12; 3х = 12; х = 12 : 3; х = 4. 2х + 3х = 15; 5х = 15; х = 15 : 3; х = 5. 10х + х = 33; 11х = 33; х = 33 : 11; х = 3. х + 3х + 5х = 18; 9х = 18; х = 18 : 9; х = 2. б) 5х – х = 16; 4х = 16; х = 16 : 4; х = 4. 8х – 5х = 15; 3х = 15; х = 15 : 3; х = 5. 13х – 10х = 9; 3х = 9; х = 9 : 3; х = 3. 7х – 2х – х = 8; 4х = 8; х = 8 : 4; х = 2.