Răspuns:
Explicație pas cu pas:
a) 7x+(13-21) = 48 => 7x -8 = 48 => 7x = 48+8 => 7x = 56
x = 56:7 => x = 8 ∈ Z
b) 5x-(12-19) = -48 => 5x +7 = -48 => 5x = -48-7 => 5x = -55 =>
x = -55:5 => x = -11 ∈ Z
c) 12x +(-53-21) = 46 => 12x-74 = 46 => 12x = 46+74 => 12x = 120 =>
x = 120:12 => x = 10 ∈ Z
d) 3x +(25-62) = 23 => 3x-37 = 23 => 3x = 23+37 => 3x = 60 =>
x = 60:3 => x = 20 ∈ Z
e) 8x-52:(-4) = -59 => 8x +13 = -59 => 8x = -59-13 => 8x = -72 =>
x = -72:8 => x = -9 ∈ Z
f) -84:(-6) -3x = 29 => 14 -3x = 29 => 3x = 14-29 => 3x = -15 =>
x = -15:3 => x = -5 ∈ Z