(157-9*x)/10+987=1000
(157-9*х)/10+987=1000 (157-9*х)/10=1000-987 (157-9*х)/10=13 (157-9*х)=13*10 157-9х=130 9х=150-130 9х=20 х=20:9 х=2,22 (157-9*2,22)/10+987=1000 (157-19,98)/10+987=1000 137,02/10+987=1000 13,702+987=1000 1000=1000