-8x + 4 = -4x; (-8+4)x = -4; x = 1.
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8x + 12 = 4x - 4 8x - 4x = -4 - 12 4x = -16 x = -4
8x+2y=4x=-y/4+0.5y=-4x+2
8x-5=23+4x 8x-5-4x=23+4x-4x 4x-5=23 4x-5+5=23+5 4x=28 4x/4=28/4 x=7
8x+5=4x+17 4x=12 subtract 4x from right and 5 from left x=3 divide both sides by 4
16x2 + 8x + 1 = 0 : This factorises to (4x + 1)(4x + 1) = 0 When 4x + 1 = 0 then 4x = -1 : x = -1/4.