x*6=42 x*9=y

x=42:6 x=y:9

x=7 x=4 y=36

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7*6=42 4*9=36

42=42 36=36

9*x=63 y*x=56

x=63:9 x=56:y

x=7 x=7 y=8

------------- --------------

9*7=63 8*7=56

63=63 56=56

4*6=x 8*y=x

x=4*6 x=8*y

x=24 x=40 y=5

-------‐---- ----------------

4*6=24 8*5=40

24=24 40=40