First you might want to divide both sides by 7 so you have
-x+y=-7
Now you can write this as y=x-7
So the graph is a line with slope 1 and y intercept -7.
To graph it, place a point ( a dot) at (0,-7) Now to find the next point go up one unit and over to the right one unit. Connect the dots and you have the desired line.
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42
7x2 plus 7x5 = 49
-8 + 7(6x) + 3 = -7x - 5 - 1-8 + 42x + 3 = -7x - 5 - 142x - 8 + 3 = -7x - 5 + (-1)42x - 5 = - 7x - 642x + 7x - 5 + 5 = - 7x + 7x - 6 + 549x = -149x/49 = -1/49x = -1/49
-46 = 3x + 7x
-x + y = -7. There is nothing more that can be done with just one equation and two unknowns.