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a) = 23x-15x-15= 8x-15
b) = se quitan los paréntesis -(a)=-a o -(-a)= +a
-6x-9x+75-156-25= -15x-106
c) = 929x
d) = 1170x
e)1*246 *530x + ( -25396 *790x )= -19932460x