Question

Rezolvati in R ecuatiile:
a) 5(x+2)-18=2(x-5)-x
b) 3(y+4)-(-3+y)(-2)=3

Answer 1

a) 5x+10-18=2x-10-x=>
5x+10=x-10+18=>5x+10+10-18=x
5x+2=x; 4x=2;x=0,50

Answer 2

a)
5 ( x + 2 ) - 18 = 2 ( x - 5 ) - x
5 x + 10 - 18 = 2 x - 10 - x 
5 x - 8 = x - 10 
5 x - x = - 10 + 8 
4 x = - 2 
x =  ( - 2 ) : 4 = - 1/2 = - 0,5


b)
 3 ( y + 4 ) - ( - 3 + y )(-2) = 3
3 y + 12 - ( 6 - 2 y ) = 3 
3 y + 12 - 6 + 2 y = 3 
5 y = 3 - 6 
5 y = - 3 
y = -3/5