Question

rezolvati in multimea nr intregi ecuatiile: b) -3•(-3x+1)+14=3(7x-3)-10..... c) 14+2•[3-2(x-3)]:2=37..... d) -4-{6-[-3+(-3)+(-5-x)-7]-9} =1

Answer 1

 b) -3•(-3x+1)+14=3(7x-3)-10 
9x-3+14=21x-9-10 
9x+11=21x-19 
12x=30
x=30/12
x=5/2

c) 14+2•[3-2(x-3)]:2=37
 [3-2x+6)]=37-14
3-2x+6)=23
9-2x=23
2x=-14
x=-7

d) -4-{6-[-3+(-3)+(-5-x)-7]-9} =1
-4-[6-(-6-5-x-7)-9] =1
-4-[6-(-18-x)-9] =1
-4-(6+18+x-9) =1
-4-24-x+9 =1
x=-20