Răspuns:
a) 9(x-2)= - 63 =>
9x-18= - 63 =>
9x= - 63+18 =>
9x= -45 =>
x= - 45:9 =>
x= -5.
c) 2(4x+1)-2(5x-7) =
8x+2-10x+14=0 =
8x-10x= - 2-14 =
-2x= - 16 =
x= - 16: - 2
x= 8
e) 1-4(5(x-2))=21 =
1-4(5x-10)= 21 =
1-20x+40= 21 =
1+40-21= +20x =
41-21= 20x =
20= 20x =
x=20:20 =
x= 1.
b) 5(x+3)=2(5x-5) =
5x+15=10x-10 =
5x-10x= - 15-10 =
-5x= - 25 =
x= - 25: - 5 =
x= 5.