7x +5 = 3x -15
4x = -20
x = -5
Answer:
7x+5=3x-15 x=-5
Step-by-step explanation:
Subtract from both sides
7x+5-5=3x-15-5
{Simplify}
7x=3x-20
{Subtract}{3x from both sides}
7x-3x=3x-20-3x
4x=-20
Divide both sides by 4
4x over 4= -20 over 4
x=-5
