Question

Rezolvați ecuațiile : a) (2x-3)*6=54-6x.
b) 512:(9x-19)-4=120:2

Answer 1

(2X-3)·6=54-6X
12X-18=54-6X
12X+6X+=54+18
18X=72
x=72:18
x=4


512 : ( 9x - 19 ) - 4 = 120 : 2
512 : ( 9x - 19 ) - 4 = 60
512 : ( 9x - 19 ) = 60 + 4 
512 : ( 9x - 19 ) = 64
9x - 19 = 512 : 64
9x - 19 = 8
9x = 8 + 19
9x = 27 
x = 27 : 9
x= 3

Answer 2

$\displaystyle a). (2x-3)\cdot6=54-6x. \\ 12x-18=54-6x \\ 12x+6x=54+18 \\ 18x=72 \\ x= \frac{72}{18} \\ x=4 \\ b).512:(9x-19)-4=120:2 \\ 512:(9x-19)-4=60 \\ 512:(9x-19)=60+4 \\ 512:(9x-19)=64 \\ 9x-19=512:64 \\ 9x-19=8 \\ 9x=8+19 \\ 9x=27 \\ x= \frac{27}{9} \\ x=3$