Explicación paso a paso:
2x + 40 + 30 = 90
2x + 70 = 90
2x. = 90 - 70
2x = 20
x = 10
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Explicación paso a paso:
2x + 40 + 30 = 90
2x + 70 = 90
2x. = 90 - 70
2x = 20
x = 10