8 - 10 + 7 = 5
x = 4
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If I am correct, 9 plus 7 equals 112.
This equation is not possible. Two plus three plus four plus five does not equal 287. The system has no solution.
basically you asked what -28+21 which equals -7
59
9 plus 7 equals 144. Generally, x plus y = x(x+y).