(46-x)*19=418 17(5x-16)=238 9(143-13x)=234
(46-х)*19=418 874-19х=418 -19х=418-874 -19х=-456 х=24 17(5х-16)=238 5х-16=14 5х=14+16 5х=30 х=6 9(143-13х)=234 143-13х=26 -13х=26-143 -13х=-117 х=9