x+5=10
x+5-5=10-5
x=5
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8 - 10 + 7 = 5 x = 4
9 plus 7 equals 144. Generally, x plus y = x(x+y).
so 3x + 2 = x + 12 ie 2x = 10 x =5
2 squared plus 2 x 3 = 10, 7 squared plus 7 x 2 = 63, 6 squared plus 6 x 5 = 66,8 squared plus 8 x 4 = 96 so 9 squared plus 9 x 7 = 81 + 63 = 144.
x + 3x - 10 = 5 - 4 4x - 10 = 1 4x = 1 + 10 x = 11/4