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2q-4-\left(-7q\right)-\left(-4\right)
To find the opposite of -7q-4, find the opposite of each term.
2q-4+7q-\left(-4\right)
The opposite of -7q is 7q.
2q-4+7q+4
The opposite of -4 is 4.
9q-4+4
Combine 2q and 7q to get 9q.
9q
Add -4 and 4 to get 0.
2q-4-\left(-7q\right)-\left(-4\right)
To find the opposite of -7q-4, find the opposite of each term.
2q-4+7q-\left(-4\right)
The opposite of -7q is 7q.
2q-4+7q+4
The opposite of -4 is 4.
9q-4+4
Combine 2q and 7q to get 9q.
9q
Add -4 and 4 to get 0.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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y = 3x + 4
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699 * 533
Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}