A 10.(2y-10)= B (x+5)-(5x-1)= C (7-2x).(2x-7)= Maaf ya. Titik ( . ) itu kali Ok

[tex]a. \:20y - 100 = 0 \\20y = 100 \\y = 5 \\ b. \: x(5x -1) + 5(5x - 1) = \\5x { }^{2} - 5x + 25x - 5 = \\ 5x {}^{2} + 20x - 5 \\ c. 7(2x - 7) - 2x(2x - 7) = \\ 14x - 49 - 4x {}^{2} + 14x = \\ - 4x {}^{2} +28x - 49[/tex]
itu jwbannya
klo benar jadikan jwban sya yg terbaik

A. 10.(2y-10)=
20y - 100 = 0
20y = 100
y = 5
B. (x+5)-(5x-1) = -4x + 6
-4x = -6
x = 3/2
C. (7-2x).(2x-7) = 14x - 49 - 4x² + 14x
-4x² + 28x - 49 = 0
4x² - 28x + 49 = 0