Матем 50-(40-х)×3+2=10
50 - ( 40 - x ) • 3 + 2 = 10 50 - ( 40 - x ) • 3 = 8 ( 40 - x ) • 3 = 42 40 - x = 42 : 3 - x = 14 - 40 X = 26
50-120+3x+2=10 3x=78 x=26