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5 +13 = 5x -3x
18 = 2x
18/2 = x
9 = x
x = 9
Comprobamos:
3x +5 = 5x -13
3(9) +5 = 5(9) -13
27 +5 = 45 -13
32 = 32
5+13 = 5x-3x
18 = 2x
18/2 = x
9 =x
x = 9