SOLUTION: Solve: a) 7x - 10 = 12 b) 3x = 9x - 15 c) 4(x - 9) = (x - 5) + 9

Algebra ->  Equations -> SOLUTION: Solve: a) 7x - 10 = 12 b) 3x = 9x - 15 c) 4(x - 9) = (x - 5) + 9      Log On


   

Question 282243: Solve:
a) 7x - 10 = 12
b) 3x = 9x - 15
c) 4(x - 9) = (x - 5) + 9
Answer by Mathematicians(84) About Me  (Show Source):
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a) 7x+-+10+=+12
b) 3x+=+9x+-+15
c) 4%28x+-+9%29+=+%28x+-+5%29+%2B+9

For part a:
a) 7x+-+10+=+12
7x+=+22 add 10 on both sides
highlight%28x+=+22%2F7%29 divide 7 on both sides

For part b:
b) 3x+=+9x+-+15
-6x+=+-15 subtract 9x on both sides
highlight%28x+=+5%2F2%29 divide both sides by -6 and simplify
For part c:
c) 4%28x+-+9%29+=+%28x+-+5%29+%2B+9
4x+-+36%29+=+x+%2B+4+ combine like terms and distribute
3x+=+40 subtract x on both sides and add 36 on both sides
highlight%28x+=+40%2F3%29 divide 3 on both sides