Solve for x
x = \frac{34}{7} = 4\frac{6}{7} \approx 4.857142857
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30-21x+70x=105x-140-21x
Multiply both sides of the equation by 105, the least common multiple of 7,5,3.
30+49x=105x-140-21x
Combine -21x and 70x to get 49x.
30+49x=84x-140
Combine 105x and -21x to get 84x.
30+49x-84x=-140
Subtract 84x from both sides.
30-35x=-140
Combine 49x and -84x to get -35x.
-35x=-140-30
Subtract 30 from both sides.
-35x=-170
Subtract 30 from -140 to get -170.
x=\frac{-170}{-35}
Divide both sides by -35.
x=\frac{34}{7}
Reduce the fraction \frac{-170}{-35} to lowest terms by extracting and canceling out -5.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
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}