Assuming the equation is 3x - 6 + 3 = 15, here's how to solve it.
3x - 6 + 3 = 15 Combine like terms
3x - 3 = 15 Move Xs to one side and constants to another
3x = 18 Divide both sides by 3
x = 6
Check that x = 6 satifies the equation (it does)
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3x+7=15 -7 -7 3x=6 (Divide) 3 3 x=2 Check it: 3(2)+7=15 6+7=15 15=15 :D
x = 15 as 4*15+6 = 66 3*15+21 = 66 or an easier way to do it 4x - 3x = 1x 21 - 6 = 15 1x = 15
-3x=-15+6 -3x=-9 x=-9/-3 x=3
3X + 6 = 21 subtract 6 from each side 3X = 15 divide both sides integers by 3 X = 5 =======check 3(5) + 6 = 21 15 + 6 = 21 21 = 21 ========checks
2x+3=3x-3 2x-3x=-3-3 -x=-6 x=6