Question

a) 2x + x /5 = 2x - x + 21

b) 2x - 6/4 = x + 2/3

alguém ajuda

Answer 1

b)2x+x/5=2x-x+21

denominador diferentes tem de tirar o m.d.c

10x+x=10x-5x+105

11x-10x+5x=105

15x-10x=105

5x=105

X=105/5

X=21

b)2x-6/4=x+2/3

24x-18=12x+8

24x-12x=8+18

12x=26

X=26/12=13/6