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Evaluate Numerical Expressions Involving Integers

Simplify: -x+7x+10y-8y if x=3 and y=9.

Evaluate 5x+3x-4y-7y if x=1 and y=2.

Simplify: (-4x)(-2) if x=4.

Simplify: 15y/3 if y=7.

Simplify: 20x/5 if x=10.

Simplify: 15x-10x+9y+10y if x=-2 and y=0.

Simplify: -4x-6x+15y-9y if x=3 and y=4.

Simplify: 3x(2) if x=5.

Simplify: (5xy)(-4) if x=1 and y=2.

Evaluate 10x-4x+4y+5y if x=-1 and y=1.