Question

Rezolvați in multimea Z ecuatiile:
a)5x-6-3 (x+4)=3 (x-5)-7
b)2[3 (2x+5)-4]-7=3
c)5 (2x-7)-3 (3x-8)=9x-16-2(3x-5)+13
d)2 [15-4(3x-8)]-7=3[18-5 (2x-3)]+18
urgent va rog

Answer 1

a)5x-6-3x-12=3x-15-7
2x-18=3x-22
-x=-4 rezulta ca x=4
b)2(6x+15-4)-7=3
12x+22-7=3
12x+15=3
12x=-12 rezulta ca x=-1
c)10x-35-9x+24=9x-16-6x+10+13
x-11=3x+7
-2x=18 rezulta ca x=-9
d)2(15-12x+24)-7=3(18-10x+15)+18
78-24x-7=66-30x+18
71-24x=84-30x
6x=12 rezulta ca x=2