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Solución:
a) x + 6 = 10
x = 10 - 6
x = 4
b) 7 = y + 2
7 - 2 = y
5 = y
c) x - 3 = 8
x = 8 - 3
x = 5
d) 13 · x = 260
x = 260/13
x = 20
e) 2x + 5 = 17
2x = 17 - 5
2x = 12
x = 12/2
x = 6
f) x + 4x - 1 = x + 15
5x - 1 = x + 15
5x - x = 15 + 1
4x = 16
x = 16/4
x = 4
g) 8x - 3x = 35
5x = 35
x = 35/5
x = 7
h) x·(7 - 2) + 11 = 16
x·(5) = 16 - 11
5x = 5
x = 5/5
x = 1
i ) 3x + 7 = 19 - 3x
3x + 3x = 19 - 7
6x = 12
x = 12/6
x = 2