f)x+ (-5)=4 <=> x = 5+4 => x = 9
g)x+(-7)=-2 <=> x = 7-2 => x = 5
h)x+(-2)=-4 <=> x = 2-4 => x = -2
i)-4+x=3 <=> x = 4+3 => x = 7
j)-10+x=2 <=> x = 10+2 => x = 12
k)-12+x=-4 <=> x = 12-4 => x = 8
l)x-(-2)=3 <=> x = 3-2 => x = 1
m)x-(-6)=-3 <=> x = -3-6 => x = -9
n)x-(-8)=-10 <=> x = -8-10 => x = -18
o)x-(-5)=2 <=> x = -5+2 => x = -3
p)x-(-4)=-3 <=> x = -4-3 => x = -7