Question

Sa se rezolve ecuatiile :
a) 5x+ 3(x-6)= 7x+ 13
b)6x+ 4(x-8 ) = 9x + 21
c) 5(x-7) -2x = x-41
d)7( x-9) -4x = x -39
e) 4( x+5 )- 3(x-3)= 2( x+15)

Answer 1

a) 5x+3(x-6)=7x+13
5x+3x-18=7x+13
5x+3x-7x=13-18
x=-5
b) 6x+4(x-8)=9x+21
6x+4x-32=9x+21
6x+4x-9x=21+32
x=53
c) 5(x-7)-2x=x-41
5x-35-2x=x-41
5x+2x-x=-41+35
6x=-6
x=-1
d)7( x-9) -4x = x -39
7x-63-4x=x-39
7x+4x-x=-39+63
10x=24
x=2,4
e)4( x+5 )- 3(x-3)= 2( x+15)
4x+20-3x-9=2x+30
4x-3x-2x=30-20+9
-1x=19
x=-19