X - 3/ 4 = 12

(it's x - 3 over 4 and i'm lost at what to do.)

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

Which of the following equations are equivalent to -2m - 5m - 8 = 3 + (-7) + m? -15m = -4m -7m - 8 = m - 4 -3m - 8 = 4 - m m - 4 = -7m - 8 -8 - 7m = -4 + m -8 - 3m = 4 - m

Simplify using positive exponents only.