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, 2 x d + 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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