Resolviendo ecuaciones lineales en dos pasos usando sumas y restas: $ax + b = c$

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Now Playing:Es solve linear equations using addition and subtraction – Example 1a

Encuentra el valor de x de acuerdo al diagrama:
Encuentra $x$ de acuerdo a los bloques algebraicos:
Resuelve:
1. $7x + 9 = 21$

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