Question

Rezolvati in Z ecuatiile:

c) 2[3(2x+5)-4]-7=3

d) 2[15-4(3x-8)]-7=3[18-5(2x-3)]+18

Answer 1

c) 2[3(2x+5)-4]-7=3
2[3(2x+5)-4]=3+7
2[3(2x+5)-4]=10
3(2x+5)-4=5
3(2x+5)=5+4
3(2x+5)=9
2x+5=3
2x=3-5
2x=-2
x=-1

 d) 2[15-4(3x-8)]-7=3[18-5(2x-3)]+18
30-8(3x-8)]=54-15(2x-3)]+25
30-24x+64=79-30x+45
6x=30
x=5