[tex]2x + 12 = 26[/tex]
[tex]2x = 26 - 12[/tex]
[tex]2x = 14[/tex]
[tex]x = 14 \div 2[/tex]
[tex]x = 7[/tex]
[tex]x + x + 1 + x + 2 = 99[/tex]
[tex]3x + 3 = 99[/tex]
[tex]3x = 99 - 3[/tex]
[tex]3x = 96[/tex]
[tex]x = 96 \div 3[/tex]
[tex]x = 32[/tex]
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[tex]2x + 12 = 26[/tex]
[tex]2x = 26 - 12[/tex]
[tex]2x = 14[/tex]
[tex]x = 14 \div 2[/tex]
[tex]x = 7[/tex]
[tex]x + x + 1 + x + 2 = 99[/tex]
[tex]3x + 3 = 99[/tex]
[tex]3x = 99 - 3[/tex]
[tex]3x = 96[/tex]
[tex]x = 96 \div 3[/tex]
[tex]x = 32[/tex]