Question

calcule x:
a) 7x - 10 = x+50
b) 5x = x + 100
c) 5x - 70= 2x +20
d) 2x+25= x/2 +20

Answer 1

7x-x= 50+10
6x= 60
x= 60/6
x= 10

5x-x= 100
4x= 100
x= 100/4
x= 25

5x-2x= 20+70
3x= 90
x= 90/3
x= 30

Answer 2

a) 7x - 10 = x+50

7x-x=50+10

6x=60

x=60/6

x=10

b) 5x = x + 100

5x-x=100

4x=100

x=100/4

x=25

c) 5x - 70= 2x +20

5x-2x=20+70

3x=90

x=90/3

x=30

d) 2x+25= x/2 +20

2x-x/2=20-25

2x/1-x/2=-5

∧

mmc:-3x/2=-5 regra do três

-3x/2=-5/1

-3x=-10

x=-10/3 ou x =3,33