Răspuns :
Răspuns:
a) 7x-20=2x+15 b)8x-4x=22+2x c)9(x-5)=4x+3x+15
7x-2x-20=15 4x=22+2x 9x-45=4x+3x+15
7x-2x=15+20 4x-2x=22 9x-45=7x+15
5x=15+20 2x=22 9x-7x-45=15
5x=35 x=22:2 9x-7x=15+45
x=35:5 x=11 2x=15+45
x=7 2x=60
x=60:2
x=30
Explicație pas cu pas: