a) 5x - 20 - 3x = 2x - 20
b) 8y + 2(4y+1) = 8y + 8y + 2 = 16y + 2 = 2(8y + 1)
в) -c - 7 + 3c = 2c - 7
г) 6(-4m - 3) + 18 = -24m - 18 + 18 = -24m
a) 5x - 20 - 3x = 2x - 20
b) 8y + 2(4y+1) = 8y + 8y + 2 = 16y + 2 = 2(8y + 1)
в) -c - 7 + 3c = 2c - 7
г) 6(-4m - 3) + 18 = -24m - 18 + 18 = -24m