78=7+x

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I know this has already been answered, but another way to do this is moving all the numbers to one side of the equal sign and the "x" on the other. Keep one thing in mind though when you do this, any number you move from one side to the other of the = sign will become the opposite. 7 becomes -7, -8 becomes 8 etc.so78=7+x78-7=x71=xthen you can check your answer by substituting 71 for x and see that you get a statement that makes sense.Really handy for quickly checking your answers.78=7+71.you could rewrite this equation many ways:78=7+x78-7=x  71 = x-x=-78+7  -x = -71  x = 71and they'll all give you the same answer; as long as you remember to switch positive and negative signs when you switch sides, this will work.good luck!:)