Explicación paso a paso:
[tex]1. \: 4x + 3 = 21 \\ 4x = 18 \\ x = 4.5 \\ \\ 2. \: 6x = 18 \\ x = 3 \\ \\ 3. \: 4 + 2x = 12 \\ 2x = 8 \\ x = 4[/tex]
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Explicación paso a paso:
[tex]1. \: 4x + 3 = 21 \\ 4x = 18 \\ x = 4.5 \\ \\ 2. \: 6x = 18 \\ x = 3 \\ \\ 3. \: 4 + 2x = 12 \\ 2x = 8 \\ x = 4[/tex]