4x + 2y = 20
2y = -4x + 20
y = -2x + 10.......but you may also write it as y = 10 - 2x.
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y = -2x+10
4x+2y = 20 2y = -4x+20 y = -2x+10
803 + 20 = 823823 - 100 = 723803 plus 20 minus 100 equals 723.
1985 plus 20 is 2005
-15 plus 20 is 5.