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sea la foto= x + 234
el marco= x
total= 1286
entonces, x+234+x=1286
despejando
x+x =1286- 234
2x= 1052
x=1052/2
x=526
x vale 526, ahora sustituyendo queda:
foto= x+ 234 = 526+234= 760 pesos
marco= x = 526 pesos
marco ´foto suman 1286 pesos