3x + 5 = –4x + 19; ⅓x – 1 = ¼ (x + ⅘).
(1/3)х–1=(1/4)х+(1/4)·(4/5) (1/3)х–1=(1/4)х+(1/5) (1/3)х–(1/4)х=(1/5)+1 (4/12)х–(3/12)х=(1/5)+(5/5) (1/12)х=(6/5) х=(6/5):(1/12) х=(6/5)·12 х=72/5 х=14,4