-20 + 13 = -7
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A negative number divided by a positive number will be a negative number. For example: -20 / 4 = -5 -100 / 2 = -50 Here are the other cases of division by positive or negative numbers. A negative number divided by a negative number would be a positive number. A positive number divided by a positive number would be a positive number. A positive number divided by a negative number would be a negative number.
13 10 17 15 21 13 - 10 = -3 10 - 17 = +7 17 - 15 = -2 15 - 21 = +6 The negative numbers alternate with the positive numbers The negative numbers are augmented by +1 each step The positive numbers are diminished by -1 each sterp So the next step from 21 is a negative and should be -2 increased by +1 to -1 giving a new value of 20 Then the next step is a positive and should be +6 decreased by -1 to +5 giving 25 13 - 10 = -3 10 - 17 = +7 17 - 15 = -2 15 - 21 = +6 21 - 20 = -1 20 - 25 = +5
-x + 7 = 27 Subtract 7 from both sides: -x = 20 or x = -20
you need to reorder the problem by manipulating the numbers -2x-7=-x+13 group your variables and constants thus -x-2x=7+13 simplify -3x=20 simplify again x=-20/3
negative 20