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It is an expression and if it contains an equality sign then it is an equation.
An equation is linear when it contains only variables of degree 1 and constants. ALL linear equations will be of the form: a1x1+a2x2+a3x3+...+anxn=c where an and c are constants.
Constants (numbers), variables, the four basic operations of arithmetic (+, -, *, /) as well as brackets and indices (including negative and fractional ones).
multiterm mathematical expression: a mathematical expression consisting of the sum of a number of terms, each of which contains a constant and variables raised to a positive integral power
An expression cannot contain only coefficients; a coefficient inplies the presence of a variable as well. If all variables are removed, only constants may remain and are usually grouped into a single constant.