Verify
true
Share
Copied to clipboard
-18\left(-2\right)+84=70\left(\frac{-2}{7}-1\right)+210
Multiply both sides of the equation by 210, the least common multiple of 10,7,5,3.
36+84=70\left(\frac{-2}{7}-1\right)+210
Multiply -18 and -2 to get 36.
120=70\left(\frac{-2}{7}-1\right)+210
Add 36 and 84 to get 120.
120=70\left(-\frac{2}{7}-1\right)+210
Fraction \frac{-2}{7} can be rewritten as -\frac{2}{7} by extracting the negative sign.
120=70\left(-\frac{2}{7}-\frac{7}{7}\right)+210
Convert 1 to fraction \frac{7}{7}.
120=70\times \frac{-2-7}{7}+210
Since -\frac{2}{7} and \frac{7}{7} have the same denominator, subtract them by subtracting their numerators.
120=70\left(-\frac{9}{7}\right)+210
Subtract 7 from -2 to get -9.
120=\frac{70\left(-9\right)}{7}+210
Express 70\left(-\frac{9}{7}\right) as a single fraction.
120=\frac{-630}{7}+210
Multiply 70 and -9 to get -630.
120=-90+210
Divide -630 by 7 to get -90.
120=120
Add -90 and 210 to get 120.
\text{true}
Compare 120 and 120.
Examples
Quadratic equation
{ 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}