x-7 - x decreased by 7, 7-x - 7 decreased by x, n+10 - a number increased by 10, 32/c - 32 split into c groups, 4t - 4 times a number, 2d + 6 - 2 times a number plus 6, 12+b - 12 increased by b, a number, a variable, and an operation - an expression, a number, a variable, an operation, and an equal sign - an equation, a letter that represents and unknown amount - a variable,

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