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28\left(x+y\right)+56\left(x-y\right)=3\times 14
Multiply both sides of the equation by 84, the least common multiple of 6,3,28.
28x+28y+56\left(x-y\right)=3\times 14
Use the distributive property to multiply 28 by x+y.
28x+28y+56x-56y=3\times 14
Use the distributive property to multiply 56 by x-y.
84x+28y-56y=3\times 14
Combine 28x and 56x to get 84x.
84x-28y=3\times 14
Combine 28y and -56y to get -28y.
84x-28y=42
Multiply 3 and 14 to get 42.
84x=42+28y
Add 28y to both sides.
84x=28y+42
The equation is in standard form.
\frac{84x}{84}=\frac{28y+42}{84}
Divide both sides by 84.
x=\frac{28y+42}{84}
Dividing by 84 undoes the multiplication by 84.
x=\frac{y}{3}+\frac{1}{2}
Divide 42+28y by 84.
28\left(x+y\right)+56\left(x-y\right)=3\times 14
Multiply both sides of the equation by 84, the least common multiple of 6,3,28.
28x+28y+56\left(x-y\right)=3\times 14
Use the distributive property to multiply 28 by x+y.
28x+28y+56x-56y=3\times 14
Use the distributive property to multiply 56 by x-y.
84x+28y-56y=3\times 14
Combine 28x and 56x to get 84x.
84x-28y=3\times 14
Combine 28y and -56y to get -28y.
84x-28y=42
Multiply 3 and 14 to get 42.
-28y=42-84x
Subtract 84x from both sides.
\frac{-28y}{-28}=\frac{42-84x}{-28}
Divide both sides by -28.
y=\frac{42-84x}{-28}
Dividing by -28 undoes the multiplication by -28.
y=3x-\frac{3}{2}
Divide 42-84x by -28.