Add: 3mn, − 5mn, 8mn, −4mn

3mn + (−5mn) + 8mn + (−4mn) = mn (3 − 5 + 8 − 4)

= 2mn

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Subtract: 6xy from − 12xy

Add the following algebraic expression:

\[\frac{3}{2}a - \frac{5}{4}b + \frac{2}{5}c, \frac{2}{3}a - \frac{7}{2}b + \frac{7}{2}c, \frac{5}{3}a + \frac{5}{2}b - \frac{5}{4}c\]

Subtract:

− 5xy from 12xy

Solve the following equation.

`4"x"+1/2=9/2`

Find the sum of the following expressions

a + 5b + 7c, 2a + 10b + 9c

Find the sum of the following expressions

mn + t, 2mn – 2t, – 3t + 3mn

a(b + c) = a × ____ + a × _____.

Add:

3a(a – b + c), 2b(a – b + c)

Sum of x² + x and y + y² is 2x² + 2y².

How much is y⁴ – 12y² + y + 14 greater than 17y³ + 34y² – 51y + 68?