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Gasiti multimea solutiilor reale ale ecuatiilor :
a) 5(2x-3)-8(3x+7)+63=3(6-5x)-13


Răspuns :

10x-15-25x-56+63=18-15x-13
10x-25x-15x==15=56-63-13
-30x=-5
x=-30:(-5)
  =+6