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Every basic math book, teacher, and site will teach you this. Find me one place online that shows otherwise.
Moreover, they also know that subtraction is the adding of a negative number and division by c is multiplication by 1/c.
math.berkeley.edu...
The example in (3) is perhaps a bit extreme, and was concocted to make a
point. However, the next one is taken from p. 207 of a school mathematics review
book [1]:
Evaluate 4 + 5 * 6 / 10.
Now one never gets a computation of this type in real life, for several reasons. In mathematics, the division symbol basically disappears after grade 7. Once fractions are taught, it is almost automatic that 6/10 would be replaced by 6*(1/10). Moreover, if anyone wants you to compute 4 + 5*6/10, he would certainly make sure that you do what he wants done, and would put parentheses around 5*6/10 for emphasis.
Multiplication and division can be similarly expressed so the order of execution makes no difference.