Solve for a
a=5
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4a=40-20
Subtract 20 from both sides.
4a=20
Subtract 20 from 40 to get 20.
a=\frac{20}{4}
Divide both sides by 4.
a=5
Divide 20 by 4 to get 5.
Examples
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\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
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Limits
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