Răspuns:
Explicație pas cu pas:
a) 3(2x+1)-4(x+3)=5-2(2x+1)
6x+3-4x-12=5-4x-2
6x-4x=5-2+12-3
6x=12
x=2
b) 5x-6-3(x+4)=3(x-5)-7
5x-6-3x-12=3x-15-7
5x-3x+3x=-15-7+12+6
-x=-4
x=4
c) 2[15-4(3x-8)]-7=3[18-5(2x-3)]+18
2[15-12x+32]-7=3[18-5(2x-3)]+18
2(47-22x)-7=3(33-10x)+18
94-24x-7=117-30x
-24x+30x=117-87
6x=30
x=5