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9 + 6 + (-10) = 15 - 10 = 5
(-5-8) + 20 = -13 + 20 = 7
15 - (-2) = 15 + 2 = 17
20[12 + (4 -6)] = 20[ 12 + (-2)] = 20[12 -2] = 20[10] = 200
X + 12 = -10 pasamos a restar el 12
X = -10 - 12 como los signos son iguales se suman
X = - 22
20 + x = 12 paso a restar el 20
x = 12 - 20 como los signos son diferentes se restan al mayor el menor
x = - 20
15 + x = 20 paso a restar el 15
x = 20 - 15
x = 5
(- 4) + x = - 12 ahora paso a sumar el 4
x = - 12 + 4 signos diferentes se restan
x = - 8
x + (-6) = 9 elimino paréntesis
x - 6 = 9 paso a sumar el 6
x = 9 + 6
x = 15