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7x + 30 = 3x + 70
7x - 3x = 70 - 30
4x = 40
x = 40/4
x = 10
Respuesta.
x = 10
COMPROBAMOS LA SOLUCIÓN
7x + 30 = 3x + 70
7 (10) + 30 = 3 (10) + 70
70 + 30 = 30 + 70
100 = 100
La solución es correcta!
7x + 30 = 3x + 70
7x - 3x = 70 - 30
4x = 40
x = 40 ÷ 4
x = 10 → respuesta