Вправи 1201 - 1300 » 1277 (13-16)
13) 7х = х +25; 6х = 25; х = 41/6. 14) 0,4х – 6 = 0,6х – 9; 0,2х = 3; х = 15. 15) 3х + 16 = 9 – 10х; 13х = –7; х = – 7/13. 16) 0,6 (х + 12/3) = –1,2; х + 12/3 = –2; х = –2 – 12/3; х = –32/3.
13) 7х = х +25; 6х = 25; х = 41/6. 14) 0,4х – 6 = 0,6х – 9; 0,2х = 3; х = 15. 15) 3х + 16 = 9 – 10х; 13х = –7; х = – 7/13. 16) 0,6 (х + 12/3) = –1,2; х + 12/3 = –2; х = –2 – 12/3; х = –32/3.