([tex]\frac{3}{4}[/tex]x + [tex]\frac{1}{7}[/tex]x) × 28 = 75
[tex]\frac{3}{4}[/tex]x + [tex]\frac{1}{7}[/tex]x = [tex]\frac{75}{28}[/tex]
[tex]\frac{25}{28}[/tex]x = [tex]\frac{75}{28}[/tex]
x = [tex]\frac{75}{28}[/tex] × ([tex]\frac{28}{25}[/tex])
x = [tex]\frac{75}{25}[/tex]
x = 3
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([tex]\frac{3}{4}[/tex]x + [tex]\frac{1}{7}[/tex]x) × 28 = 75
[tex]\frac{3}{4}[/tex]x + [tex]\frac{1}{7}[/tex]x = [tex]\frac{75}{28}[/tex]
[tex]\frac{25}{28}[/tex]x = [tex]\frac{75}{28}[/tex]
x = [tex]\frac{75}{28}[/tex] × ([tex]\frac{28}{25}[/tex])
x = [tex]\frac{75}{25}[/tex]
x = 3