10x plus 40 is 50x.
10+40=50 and then you just add the x so:
10x+40=50x
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5(x + 4)(x - 2)
The equation 10x - 15x + 5 = -45 + 40 can be simplified to -5x + 5 = -5. By moving the numbers to one side, it becomes -5x = -10, to 5x = 10, then x = 2.
3x + 12 + 10x = 13x + 12
It is: 10x+14 simplified
10x-7+x+7 = 11x