If: y = x+b then y-x = b
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x = -6
If a + b = 6, what is the value of 3a + 3b?
y += x means the value y+x is first calculated, and the resulting value is then assigned to y. It is equivalent to y = y+x
80 + 10 equals 90 so the missing value is zero, ie 80 + 10 = 90 - 0