First simplify, then evaluate 2 (2x-1) (2x-1) - 5x (- x + 3Y), where x = - 1, y = - 2 Give the process!

First simplify, then evaluate 2 (2x-1) (2x-1) - 5x (- x + 3Y), where x = - 1, y = - 2 Give the process!

2(2x-1)(2x-1)-5x(-x+3y)
=2(4x^2-4x+1)+5x^2-15xy
=8x^2-8x+2+5x^2-15xy
=13x^2-8x-15xy+2
x=-1,y=-2.
Then the above formula = 13 + 8-30 + 2
=-7

3Y × 0.5x + 2.5x × y simplification

3y×0.5x+2.5x×y
=1.5xy+2.5xy
=4xy
Do not understand can ask, help please adopt, thank you!

Simplification: a - (2a-2) - (5x + y) - 3 (2x-3y) (the square of A-A + 1) - 2 (the square of A-1 + 3a)
a-（2a-2）
-（5x+y）-3（2x-3y）
(square of A-A + 1) - 2 (square of A-1 + 3a)

a-（2a-2）
=a-2a+2
=-a+2
-（5x+y）-3（2x-3y）
=-5x-y-6x+9y
=-11x+8y
(square of A-A + 1) - 2 (square of A-1 + 3a)
=a-a²+1-2a²+2-6a
=-3a²-5a+3

Solution equation: 1 / 5x = 1 / 6x + 50

1 / 5x = 1 / 6x + 50 multiply by 30
6x=5x+150
6x-5x=150
x=150