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( 2x+1)² - 4x ( x+3) = 5( 3-2x )-8


Răspuns :

( 2x+1)² - 4x ( x+3) = 5( 3-2x )-8
=4x
²+4x+1-4x²-12x=15-10x-8
=4x-12x+10x=15-8-1
2x=6
x=6:2
x=3