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If its a proportion then
[tex]\\ \sf\longmapsto 42-m=m-18[/tex]
[tex]\\ \sf\longmapsto 42+18=m+m[/tex]
[tex]\\ \sf\longmapsto 2m=60[/tex]
[tex]\\ \sf\longmapsto m=\dfrac{60}{2}[/tex]
[tex]\\ \sf\longmapsto m=30[/tex]