[tex]\large{\bold{x + 15 = 20}} \\ \\ \large{\bold{x = 20 - 15}} \\ \\\large\boxed{\bold{x \: = \: 5}}[/tex]
[tex]\large{\bold{21 + y = 42}} \\ \\ \large{\bold{y = 42 - 21}} \\ \\ \large\boxed{\bold{y = 21}}[/tex]
[tex]\large{\bold{21x = 3000}} \\ \\ \large{\bold{x = \frac{3000}{21} }} \\ \\ \large\boxed{\bold{x \: = \: \frac{1000}{7} }}[/tex]
[tex]\large{\bold{6y = 10 + 18}} \\ \\ \large{\bold{6y = 28}} \\ \\ \large{\bold{y = \frac{28}{6} }} \\ \\ \large\boxed{\bold{y = \frac{14}{3} }}[/tex]
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Verified answer
[tex]\large{\bold{x + 15 = 20}} \\ \\ \large{\bold{x = 20 - 15}} \\ \\\large\boxed{\bold{x \: = \: 5}}[/tex]
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[tex]\large{\bold{21 + y = 42}} \\ \\ \large{\bold{y = 42 - 21}} \\ \\ \large\boxed{\bold{y = 21}}[/tex]
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[tex]\large{\bold{21x = 3000}} \\ \\ \large{\bold{x = \frac{3000}{21} }} \\ \\ \large\boxed{\bold{x \: = \: \frac{1000}{7} }}[/tex]
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[tex]\large{\bold{6y = 10 + 18}} \\ \\ \large{\bold{6y = 28}} \\ \\ \large{\bold{y = \frac{28}{6} }} \\ \\ \large\boxed{\bold{y = \frac{14}{3} }}[/tex]