-43
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-30 minus 13 makes an even bigger negative number, because we are subtracting, we are still taking away even more. So, we add 30 + 14 to get the answer... -44.
13 add something equals 30 = 43
5
40
To solve the equation 30 - 3 = 40 - x, you first simplify the left side to get 27. The equation now reads 27 = 40 - x. To isolate x, you subtract 40 from both sides to get -13 = -x. Finally, to solve for x, you multiply both sides by -1 to get x = 13.
Because there is no equals sign.