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[tex](3a)x - 10a = 21x + 2b[/tex]
Thus ;
[tex]3a = 21[/tex]
[tex]a = 7[/tex]
And
[tex] - 10a = 2b[/tex]
[tex] - 10(7) = 2b[/tex]
[tex] - 70 = 2b[/tex]
Divide sides by 2
[tex] \frac{ - 70}{2} = \frac{2}{2} b \\ [/tex]
[tex]b = - 35[/tex]
Done...
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