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Calculați:
4x+5=3(x+1)+7


Răspuns :

4x+5=3×(x+1)+7; 4x+5=3x+3+7; 4x+5=3x+10|-3x; x+5=10; x=5;
4X+5=3x(X+1)+7
4X+5=3X+3+7
4X+5=3X+10
4X-3X=10-5
X=5