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Resolvemos:
4x+1+2 (5+x)=x+71
4x + 1 + 10 + 2x = x + 71
4x + 2x + 1 + 10 = x + 71
6x + 11 = x + 71
6x - x = 71 - 11
5x = 60
x = 60/5
x = 12
Respuesta.
x = 12
VERIFICAMOS LA SOLUCIÓN
4x+1+2 (5+x)=x+71
4 (12) + 1 + 2 (5 + 12) = 12 + 71
48 + 1 + 2 (17) = 83
49 + 34 = 83
83 = 83
La solución es correcta!!!