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Así podemos afirmar que x = 5, es una ecuación.
a) 2x-5=5x+2
2x - 5x = 2 + 5
-3x = 7
x = -7/3
b) 4(x-1)=3(x+2)
4x - 4 = 3x + 6
4x - 3x = 6 + 4
x = 10
c) 3(x-1)-20=7
3x - 3 - 20 = 7
3x =7 + 23
3x = 30
x = 10
d) 2(x+3)+5=9
2x + 6 + 5 = 9
2x = 9 - 11
2x = -2
x = -1
e) 2x-3/2 =x+5/2
2x - x = 5/2 + 3/2
x = 4
f) x+2/4 - x+1/6 =2
1/2 + 1/6 = 2
4/6 = 2 es falso
una ecuación equivalente puede ser x = x+1