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x + 345 = 678
x = 678 - 345
x= 333
y - 450 = 635
y = 635 + 450
y = 1085
670 - w = 346
-w = 346 + 670
-w = 1016
w = -1016 (como la w esta negativa al momento que pasa positiva la cantidad cambia de signo)