izzyb428
izzyb428
31-03-2016
Mathematics
contestada
solve the equation7x+21=105
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apologiabiology
apologiabiology
31-03-2016
remmeber you can do anything to an equaiton as long as you do it ot both sides
isolate placeholder
7x+21=105
subtract 21
7x+21-21=105-21
7x+0=84
7x=84
divide both sides by 7
7x/7=84/7
x=12
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vrmeece25
vrmeece25
31-03-2016
x = 12 all you have to do is subtract 21 from 105 your answer would be 84 then you would do 84 divided by 7 and the answer would be 12 so x equals 12
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