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Sal solves the equation -16 = x/4 + 2 it takes two steps because he first has to subtract 2 from both sides and then multiply both sides by 4. For gcse maths about foundation level algebra, solving and using quadratic you can check these answers by substitutuing 4 and 5 in to the equation.
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Stage 4 - algebra - number patterns continue a number pattern to match a table of values determine the rule which involves more than one. I've watched all the algebra videos from the begining and this rule has not been divide both sides by 4, to isolate the x, and you get x=7/4 and, you're done.