5x + 2x + 6 = 48
7x + 6 = 48 ....Because you simplify 5x + 2x
7x = 42 ....Because you subtract 6 from both sides to help isolate x
x = 6 ....Because you divide both sides by 7 to isolate the x.
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5x + x - 6x + 2x = 2x
-5x+3(x+8)=16-2x
5x+18 = 2x+9 5x-2x = 9-18 3x = -9 x = -3 and y = 3
If: x+9+5x = 21+2x Then: x = 3
5x+2=2x-10 x=-4