This math topic involves solving linear equations where students have to find the number that fits in a missing place (represented by a circle) to balance the equation. Each problem consists of a linear equation with four terms, combining both constants and a variable represented by a circle. Multiple choice answers are provided for each question, from which students must select the correct solution that satisfies the equation. The problems enhance basic algebraic understanding conceptually and practically by requiring manipulation and simplification of terms to isolate and solve for the variable.
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What number can be put in the circle to make this equation correct?