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In most charts you must always label the axes.
Different examinations have different thresholds for A grades.
When adding or subtracting fractions with different denominators then their LCD must be found in order to carry out the calculations.
The 'answer' is the number that 'x' must be in order to make the statement true. If 'x' is anything different from -7, then the statement "x = -7" is not true. So the 'answer' must be -7 .