Question

a) 2x/5-1/4=x-1/10

b)2m-7/5-m/10=1/2

c)-x-20=5x-10-7x

d)2m+6=m

Answer 1

a) 2x/5-1/4=x-1/10     mmc(4;5;10) = 20
[8x  - 5 = 2.(x-1)]/20   eliminando  denominador 20

[8x -5 = 2x-2]
8x-5 = 2x-2
8x-2x= -2+5
6x= +3
x= 3/6     simplificando 3 e 6 por 3
x = 1/2


b)2m-7/5-m/10=1/2         mmc (2;5;10) = 10
[2.(2m -7) -m = 5]/10      elimina denominador 10
[4m -14 -m = 5]
4m -14 -m = 5
4m -m = 5 + 14
3m = 19
m = 19/3


c)-x-20=5x-10-7x
-x -5x +7x = -10 +20
-6x +7x = +10
x = 10



d)2m+6=m
2m -m = -6
m = -6