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4 × (x + 6) = 10x + 6
4x + 24 = 10x + 6 / - 6
4x + 18 = 10x / - 4x
18 = 6x
x = 3
Autor: x + 10 = 3 + 10 = 13
Mama: 10x + 10 = 10 × 3 + 10 = 40