SOLUTION: Solve for x . X -2/5=3/10 why does it equal 7/10

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Question 893861: Solve for x . X -2/5=3/10 why does it equal 7/10

Found 2 solutions by Fombitz, MathLover1:
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Multiply both sides by 10.
10X-%282%2F5%29%2810%29=3
10X-4=3
10X=7
X=7%2F10

Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

x+-2%2F5=3%2F10 ...first move -2%2F5 to the right side

x+=3%2F10%2B2%2F5 .. ..common denominator for 10 and 5 is 10; so, multiply and divide -2%2F5 by 2 to get denominator 10

x+=3%2F10%2B%282%2A2%29%2F%282%2A5%29
x+=3%2F10%2B+4%2F10...since denominators same, just add nominators and rewrite denominator
x+=%283%2B+4%29%2F10
highlight%28x+=7%2F10%29