How can you use quarters to estimate 180+ 320

Which is the most efficient first step to solve x in the equation 3.7x - 18 = -4.3x -34 a. add 3.7x to both sides of the equation. b. add 4.3x to both sides of the equation. c. subtract 18 from both sides of the equation. d. subtract 34 from both sides of the equation.

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Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps