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40+8x=6x+52
8x=6x+52-40
8x-6x=12
2x=12
x=12/2
x=6
8 (5 + x) = 6x + 52
40 + 8x = 6x + 52
8x - 6x = 52 - 12
2x = 12
x = 12 ÷ 2
x = 6 → respuesta