Solve for x
x=66
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80-\left(x-1\right)=10\left(2x-1\right)-5\left(4x-5\right)
Multiply both sides of the equation by 40, the least common multiple of 40,4,8.
80-x-\left(-1\right)=10\left(2x-1\right)-5\left(4x-5\right)
To find the opposite of x-1, find the opposite of each term.
80-x+1=10\left(2x-1\right)-5\left(4x-5\right)
The opposite of -1 is 1.
81-x=10\left(2x-1\right)-5\left(4x-5\right)
Add 80 and 1 to get 81.
81-x=20x-10-5\left(4x-5\right)
Use the distributive property to multiply 10 by 2x-1.
81-x=20x-10-20x+25
Use the distributive property to multiply -5 by 4x-5.
81-x=-10+25
Combine 20x and -20x to get 0.
81-x=15
Add -10 and 25 to get 15.
-x=15-81
Subtract 81 from both sides.
-x=-66
Subtract 81 from 15 to get -66.
x=66
Multiply both sides by -1.
Examples
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y = 3x + 4
Arithmetic
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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}