120 - 90x = 210
-16
n + 13 = 21. n = 21 - 13
To find what is divided by what equals 21, you can express it as an equation: ( x \div y = 21 ). This means that ( x = 21y ). For example, if you choose ( y = 1 ), then ( x = 21 ); or if ( y = 3 ), then ( x = 63 ). There are infinitely many pairs of numbers that satisfy this equation.
21
It is an equation and the value of x is 7
21
12
-16
n + 13 = 21. n = 21 - 13
3, 7, 21. 3x7 is the only equation that equals 21, and so these are the only factors of 21.
32
To find what is divided by what equals 21, you can express it as an equation: ( x \div y = 21 ). This means that ( x = 21y ). For example, if you choose ( y = 1 ), then ( x = 21 ); or if ( y = 3 ), then ( x = 63 ). There are infinitely many pairs of numbers that satisfy this equation.
21
It is an equation and the value of x is 7
9+12
5
21 is the only solution of that equation.