Solve for x
x=-11
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6x-42-7\left(x-6\right)=x+6-\left(x-5\right)
Use the distributive property to multiply 6 by x-7.
6x-42-7x+42=x+6-\left(x-5\right)
Use the distributive property to multiply -7 by x-6.
-x-42+42=x+6-\left(x-5\right)
Combine 6x and -7x to get -x.
-x=x+6-\left(x-5\right)
Add -42 and 42 to get 0.
-x=x+6-x-\left(-5\right)
To find the opposite of x-5, find the opposite of each term.
-x=x+6-x+5
The opposite of -5 is 5.
-x=6+5
Combine x and -x to get 0.
-x=11
Add 6 and 5 to get 11.
x=-11
Multiply both sides by -1.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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y = 3x + 4
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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}