If you mean x = 3 then the value of 7x-2x is 21-6 = 15
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If x = 3, then substituting x = 3 into the expression 7x - 2x gives us 7(3) - 2(3). This simplifies to 21 - 6, which equals 15. Therefore, the value of 7x - 2x when x = 3 is 15.
The idea is to replace every occurrence of "x" with "3", then do the calculations. Note, for example, that 7x means 7 times x.
2x+3=9x 3=9x-2x 3=7x x=3/7
7 x - 4 x + 2 x+5 = 2 x + 14 --- (1) Shift those terms containing "x" on left side and constants on other side 7 x - 4 x + 2 x - 2 x = 14 - 5 We will get 3 x = 9 Divide both sides by "3" we get; x = 3
If you mean: x-3 = 2x-8 then the value of x works out as 5
The value of x2+7x+10 depends on the value of X. If x=1, then x2+7x+10 = 18 If x=2, then x2+7x+10 = 28 If x=3, then x2+7x+10 = 40 and so forth
3 + 3 + 2x = 0 6 + 2x = 0 2x = -6 x = -6/2 x = -3