Question

3(x+2)=2(x+4) ; 1-4•(-5•(x-2)]=21 REPEDEE​

Answer 1

Explicație pas cu pas:

$3(x + 2) = 2(x + 4) \\ 3x + 6 = 2x + 8 \\ 3x - 2x = 8 - 6 \\x = 2 \\ 1 - 4 \ ( - 5 \ (x - 2)) = 21 \\ 1 - 4( - 5x + 10) = 21 \\ 1 + 20x - 40 = 21 \\ 20x - 39 = 21 \\ 20x = 21 + 39 \\ 20x = 60 \\ x = 60 \div 20 \\ x = 3$