Răspuns :
4X+12+15X+15=6X+9+7X+28+8 19X+27=13X+45 19X-13X=45-27 6X=18; X=18:6 ; X=3
4x +12 + 15x + 15 = 6x+9 + 7x+28 +8
19x+12=13x+45
19x-13x = 45 -12
6x = 33
x= 33 supra 6
19x+12=13x+45
19x-13x = 45 -12
6x = 33
x= 33 supra 6