4x-338=68 4x=338+68 4x=456 (35-x)=120-20. (35-x)=100. 35-x=100 x=35:100 x=0.35. 940-2a=0 -2a=-940 a=(-2)-940) a=470 620c+24)=10 (c+24)=-620+10 (c+24)=-610 c+24=-610 c=-610-24 c=634