sederhanakan bentuk aljabar berikut!!! a.2× + 7×=.. b.-5 + 13× + 2y - 5×=.. c.4× - 5y + 3× + 2y - 5×=.. d.3(× - 2y) - 2(× + 4y) - 6y=... buat jalan

a) 2x+7x= 9x
b) -5+13x+2y-5x = 13x-5x+2y-5
= 8x+2y-5
c)4x-5y+3x+2y-5x = 4x+3x-5x+2y
= 2x+2y
d) 3(x-2y) -2(x+4y)-6y
=3x-6y -2x-8y -6y
=3x-2x-6y-8y-6y
= x-20y