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x+2x+3x=3(2x+7)
11x+12=3x+36


Răspuns :

6x=6x+7. 11x-3x=36-12
6x-6x=7. 8x. =24/:8
x=7. x=3
x+2x+3x=3(2x+7)
=6x=6x+7
=6x+7-6x
=7

11x+12=3x+36
=11x+12-3x-36
=8x-24
x=24/8
x=3