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Substituting a values of $x$ and $z$ into $a(x+z)$

Substituting a values of $x$ and $z$ into $ax+bz$

Substituting a value of $x$ into $ax+b$

Substituting a value of $x$ into $x^2$ or $x^3$.

Substituting a value of $x$ into $x/a$.

Substituting a value of $x$ into $ax$

Substituting a value of $x$ into $x+a$.

Solving linear equations with unknowns on both sides

Solving equations of the form a(ex+b)=c(fx+d)

Solving equations of the form a(x+b)=c(x+d)