5Y=40+30,5
Y=40+30,5X
0=5^(2x)-20*5^x+125
0=5^2x-20*5^x+125
(P↔Q)∨(Q⇒R)⇒(P∨R)
y=35x+2
y=15x+4
–2x − 4y = 20
–3x + 10y = –2
2x − 4y = –12
7x − 9y = –2
–2x + 2y = 4
–5x + 8y = 13
x + 2y = –15
–7x + 4y = 15
