Mathematics Test—No Calculator

equals 152. Subtracting side by side the second equation from the first eliminates the variable . y, open parenthesis, 2 x. minus . y, close parenthesis, minus open parenthesis, x minus y, close parenthesis, equals 40 minus 152, leaving an equation with just one variable, x. Solving this equation gives . x. equals negative 112. ................
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