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To write the expression x - 10x + 15 in a word phrase, you would say "the difference between x and ten times x plus fifteen." This phrase breaks down the expression into its components: x (the variable), 10x (ten times the variable x), and 15 (a constant value). The word "difference" indicates the subtraction operation between x and 10x, followed by the addition of 15.
3x5 ÷ 7y4
y = 4x + 6
Multiplicand times multiplier equals product. If the expression includes a variable, the numerical factor is the coefficient.