Solve for x. Note the equal sign. What you do to one side, you do to the other. Do the opposite of PEMDAS (Parenthesis, Exponents (& roots), Multiplication, Division, Addition, Subtraction).
First, subtract 65 from both sides
15x + 65 = 35
15x + 65 (-65) = 35 (-65)
15x = 35 - 65
15x = -30
Next, isolate the x. Divide 15 from both sides
(15x)/15 = (-30)/15
x = -30/15
x = -2
-2 is your answer
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