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2-10y-20-\left(-3y-1\right)=-\left(y+5\right)
Use the distributive property to multiply -5 by 2y+4.
-18-10y-\left(-3y-1\right)=-\left(y+5\right)
Subtract 20 from 2 to get -18.
-18-10y-\left(-3y\right)-\left(-1\right)=-\left(y+5\right)
To find the opposite of -3y-1, find the opposite of each term.
-18-10y+3y-\left(-1\right)=-\left(y+5\right)
The opposite of -3y is 3y.
-18-10y+3y+1=-\left(y+5\right)
The opposite of -1 is 1.
-18-7y+1=-\left(y+5\right)
Combine -10y and 3y to get -7y.
-17-7y=-\left(y+5\right)
Add -18 and 1 to get -17.
-17-7y=-y-5
To find the opposite of y+5, find the opposite of each term.
-17-7y+y=-5
Add y to both sides.
-17-6y=-5
Combine -7y and y to get -6y.
-6y=-5+17
Add 17 to both sides.
-6y=12
Add -5 and 17 to get 12.
y=\frac{12}{-6}
Divide both sides by -6.
y=-2
Divide 12 by -6 to get -2.