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1. (2×21)-(5×8) =42-40 =2
2.(2×8)+(7×21) = 16 + 147 =163
3.( 4×21)× (2×8)=84×16 =1344
4.(15×8)-(2×21) =120 - 42 =78
5.(3×21)+...y=111 = 6y
6.(5×21)-(....y) =89 = 2y
7.(...x)+(5×8)=229 =9x