-3 - 4 - 5
rewrite as,
-3 + (-4) + (-5)
= - 12
PS this is an expression, not an equation
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The only way to simplify an addition problem is to solve it. 25+345=370
345 because 1150 divided by 10 equals 115 then times that by 3. 345 30% of 1150 is 345. Equation would be 1150 x .3 = 345
You will subtract 345 from 12,420 36 times to arrive at zero. The easiest way to solve the problem is to divided 12,420 by 345.
solve it
If you solve such an equation for "y", you get an equation in the slope-intercept form.