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1) DESFACETI PARANTEZELE SI REDUCETI TERMENII ASEMENEA: 
a) (2x-3)+(6x-10)+(13-7x)=
b) -12-(4xla a 2a +3)-x la a2a = 
c) 18-(7x-5)+(23x-21)= 
d) (-5 + a -2x)-(6x+20-5a)=




Răspuns :

a) 2x - 3 + 6x - 10 + 13 - 7x = 8x - 7x - 13 + 13 = x
b) 12 - 4x² - 3 - x² = - 5x² + 9
c) 18 - 7x + 5 + 23x - 21 = 16x + 2 = 2(8x + 1)
d) - 5 + a - 2x - 6x - 20 + 5a = 6a - 8x - 25