Book Maths Puzzle Algebra

-7(x+4)-7 = -7(-4x + 2)+ x

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I need help on a proprtion,

2u-3/4u=u-1/u I did cross product method on this one and i got



2u(squared)-3u= 4u (squared)-4u then i isolated the u and the u (squared) and came out with u=2u(squared). I think i did this all right, but i'm not sure what the u would be. I missed this lesson in math becuase i'm on homebound school because of an illness i have. If you can please help me out i would appreciate it. Thank You.
mrs jones invested $18,000.00 into two accounts. one account pays 6% simple interest and the other pays 8%. her total interest for the year was $1290.00. how much did she have in e