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The American Journal of Psychology, Vol. 107, No. 3 (Autumn, 1994), pp. 423-439 (17 pages) Students in 11th grade (N = 208) were assessed twice on the solution of algebraic word problems that ...
"Even the +, −, =, and x signs we take for granted only came into widespread use in the 17th century. Which means that the earlier algebraists we know of … all had expressed their equations mostly in ...