Solve the following inequality: $21+7x\ge21$21+7x≥21

Solve the following inequality: $3x+27>3$3x+27>3

Solve the following inequality: $6x-54\ge30$6x−54≥30

Solve the following inequality: $3n-9>9$3n−9>9

Form and solve linear equations and inequations, quadratic and simple exponential equations, and simultaneous equations with two unknowns

Apply algebraic procedures in solving problems