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7(1+6x)=(30-x)3+7
va rog frumos


Răspuns :

7+42x=90-3x+7
42x+3x=7-7+90
45x=90
x=90/45
x=2
7+42x=90-3x+7
42x+3x=90+7-7
45x=90
x=90/45
x=2