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Equivalent meaning the equations are of equal value
They are the same except equations use the equal sign =
Math equations have an equals sign such as: 7+5=12 or 9x6=47+7 Math expressions do not have a equals sign such as: 43-27 or 8x40
math is a series of numbers and equations and it was introduced by the Egyptians
Those aren't math equations. An equation always has an equal sign, between two expressions.Additional Information:-If you meant: 2x+5y = 120 and x+y = 90Then by a process of elimination: x = 110 and y = -20