The value of x works out as 10
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you just equal that equation to 0, then you solve for x 5x-8=0 5x=8 x=8/5
That depends on what the value of x is.
x-5x=4.5 -4x=4.5 x=-1.125
3 + 5x = 38 -> 5x = 35 -> x = 7
When x equals 8, the value of 5x would be 5 times 8, which is 40.