5(12m +21) +3 (11-12 m)=186 решение?​

: 2

5 ( 12m+21 ) + 3( 11- 12m ) = 186;

60m + 105 + 33 - 36m = 186;

24m + 138 = 186;

24m = 186 - 138;

24m = 48;

m = 48 : 24;

m = 2.

: 2