hola :3
[tex]4u+6=2u+21[/tex]
[tex]4u+6-6=2u+21-6[/tex]
[tex]4u=2u+15[/tex]
[tex]4u-2u=2u+15-2u[/tex]
[tex]2u=15[/tex]
[tex]\frac{2u}{2} =\frac{15}{2}[/tex]
[tex]u=\frac{15}{2}[/tex]
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Verified answer
hola :3
[tex]4u+6=2u+21[/tex]
[tex]4u+6-6=2u+21-6[/tex]
[tex]4u=2u+15[/tex]
[tex]4u-2u=2u+15-2u[/tex]
[tex]2u=15[/tex]
[tex]\frac{2u}{2} =\frac{15}{2}[/tex]
[tex]u=\frac{15}{2}[/tex]
saludos
att :sam