(4 + 18) / (2 - 5) = −7.33 to two decimal points
Using the 'Order of Operation rules' (see below) the bracketed + and - is done first, then the division to give -7.33 as the answer.
Order of Operation
1 Brackets
2 Exponents (powers and roots)
3 Multiplication and division
4 Addition and subtraction
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5 + (2 x 7) - (18/5) = 15.4
17
15 + 3 - 6 / 2 * 6 = 15 + 3 - 3 * 6 = 15 + 3 - 18 = 18 - 18 = 0
4x + 20
-1