Verified answer

Explicação passo-a-passo:

[tex]a)[/tex]

[tex]3x - 19 = 28[/tex]

[tex]3x = 28 + 19[/tex]

[tex]3x = 47[/tex]

[tex]x = \frac{47}{3} [/tex]

[tex]b)[/tex]

[tex]2x - 4 = 10[/tex]

[tex]2x = 10 + 4[/tex]

[tex]2x = 14[/tex]

[tex]x = 14 \div 2[/tex]

[tex]x = 7[/tex]

[tex]c)[/tex]

[tex]9x + 20 = 110[/tex]

[tex]9x = 110 - 20[/tex]

[tex]9x = 90[/tex]

[tex]x = 90 \div 9[/tex]

[tex]x = 10[/tex]

[tex]d)[/tex]

[tex]10x + 200 = 210[/tex]

[tex]10x = 210 - 200[/tex]

[tex]10x = 10[/tex]

[tex]x = 10 \div 10[/tex]

[tex]x = 1[/tex]