Решите уравнение 3(5-х)+13=4(3х-8)
15-3х+13=12х-32 28-3х=12х-32 -12х-3х=-28-32 -15х=-60 х=-60/(-15) х=4
3(5-х)+13 = 4(3х-8) 15 - 3х +13 = 12х - 32 15+13+32 = 12х +3х 60 = 15х Х= 60:15 Х=4 ---------- 3(5-4)+13 = 4(3*4-8) 3+13 = 4*4 16=16