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x = -2
(-9) - (-4) = -9+4=-5
x + (+7) = -12
x =-19
x = (-5) - (-3)
x = -5 + 3
x = -2
b) (-9) - (-4) = x
(-9)+4 = x
-5 =x
c) x + (+7) = (-12)
x + 7 = -12
x = -12 - 7
x = -19