First we want to cross multiply. 5 * 6 = 3c * 1 Then simplify it down and multiply 5 * 6 30 = 3c * 1 Now re-order the terms so we have an easier time multiplying! 30 = 3 * 1c Multiply 3 by 1 30 = 3c Now we want to solve for the variable c so we want to move all terms that have c to the left and all other terms to the right. Lets start by adding -3c to each side of the equation. 30 + -3c = 3c + -3c Combine our like terms... 30 + -3c = 0 Now add -30 to each side of the equation 30 + -30 + -3c = 0 + -30 Combine like terms again. 0 + -3c = 0 + -30 -3c = 0 + -30 Like terms. -3c = -30 Now simply divide both sides by -3. -3c/3 = -30/-3 This gives us 10. Therefore c = 10.
