Question

( 87 - х ) - 12 = 49 найдите x
45- ( х + 13 ) = 19

Answer 1

(87-х)-12=49
87-12-х=49
75-х=49
-х=49-75
-х=-26
х=26

45-(х+13)=19
45-х-13=19
32-х=19
-х=-13
х=13