Question

Calcule o valor de X:
a) 2+x=3
b) 7x-2x=4+1
c) 8-5x=4+2x
d) 20-10x=8-5x
e) 2-3x=1/2+1
f) -1/3+x=-3x+1

Answer 1

a) x = 3-2
x = 1

b) 7x-2x = 4+1
5x = 5
x= 1

c) 8-5x = 4+2x
-5x-2x = 4-8
-7x = -4
x = -4
-7

d) 20-10x = 8-5x
-10x+5x = 8-20
-5x=-12
x= -12/5

e) 2-3x = 1/2+1
3x = 1/2+1-2
3x = 1/2-1
3x = 1/2 - 2/2
6x = 1-2
x = -1/6

f) -1/3+x = 3x+1
-1/3 -1 = 3x-x
-1/3-1 = 2x
-1-3 = 6x
-4 = 6x
x = -2/3