4-(5-х)-(6+5х)=(2-х)*3 4-5+х-6-5х=2*3-3х -4х-7=6-3х -4х+3х=6+7 -х=13 х=-13 проверка 4-(5-(-13))-(6+5*(-13))=(2-(-13))*3 4-18-(6+(-65))=15*3 -14-(-59)=45 -14+59=45 45=45