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12x+3x (452-21^2)=2xX+103

Răspuns :

12x + 3( 452 - 441) = 2x + 103
12x + 3 *11 = 2x + 103
12x + 33 = 2x + 103
12x - 2x = 103 - 33
10x = 70
x = 70 =>  x = 7
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