Mathematics Junior High about 4 yearsago

あってるかの確認だけお願いします！😖

10x-5y=2y+54 -O (6) 10x-5y=4x+38 02-110x-53-23154 10%-72-54-② @X) 102-53-42 +38 x3 30x-2y = 162 @x3+)30x +255= -190 4g=-28 るニータ 38 32 (156 190 ③にy=7を代入 10X-7X(-7)=54 6x-53=38-④10x+49:54 10x =54-49 10:5 X = ! S x = = = = =/2/20 9 y=-7

Mathematics Junior High almost 8 yearsago

式教えてください！