Question

rezolvați in z ecuațiile: a) 8 ( x -5 ) -3 (x+1) =2x+43 ; b) -3 ( x- 5) -4 = 5-3 (x+5 ) ; c) 5 ( 2x+4 ) - ( 2*5 )*2 :4*5 =3x-2

Answer 1

a)
8(x-5)-3(x+1)=2x+43
8x-40-3x-3=2x+43
5x-43=2x+43
5x-2x=43+43
3x=86
x=86/3

b)
-3(x-5)-4=5-3(x+5)
-3x+15-4=5-3x-15
-3x+11=-3x-10
-3x+3x=-10-11
0=-21 (F)

c)
5(2x+4)-(2•5)•2:4•5=3x-2
10x+20-10•2:4•5=3x-2
10x+20-20:4•5=3x-2
10x+20-5•5=3x-2
10x+20-25=3x-2
10x-5=3x-2
10x-3x=-2+5
7x=3
x=3/7