variable - letter (3x+8=9)

coefficient -. a number or quantity placed (generally) before and multiplying another quantity, as 3 in the expression 3x.

equation - an expression or a proposition, often algebraic, asserting the equality of two quantities.

constant - a quantity assumed to be unchanged throughout a given discussion.

help/phrases - PEMDAS

p - parenthesis

e - exponents

m - multiplication

d - division

a - addition

s - subtraction

examples-

one-step equations- x+6=-3

-6=-6

x=-9

two-step equations- 5x-9=31

+9=+9

5x=40

5=5

x=8

multi-step equations- 7x+2=-54

-2=-2

7x=-56

7 7

x=-8