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x + x = 78 - 12
2x = 66
x = 66 : 2
x = 33
x + (x-12) = 78
x + x = 78 + 12
x + x = 90
2x = 90
x = 90 : 2
x = 45
La edad de Saúl es 33 y la de Toño es 45.
Las edades suman 78 => 33 + 45 = 78
Toño tiene 12 años más que Saúl => 45 - 33 = 12