3. Раскройте скобки и приведите подобные:

a) $$8(-8x + 6) + 4(-6x + 4) = 8 \cdot (-8x) + 8 \cdot 6 + 4 \cdot (-6x) + 4 \cdot 4 = -64x + 48 - 24x + 16 = (-64x - 24x) + (48 + 16) = -88x + 64$$ b) $$8(-8x + 6) - 4(-6x + 4) = 8 \cdot (-8x) + 8 \cdot 6 - 4 \cdot (-6x) - 4 \cdot 4 = -64x + 48 + 24x - 16 = (-64x + 24x) + (48 - 16) = -40x + 32$$ c) $$8(-8x + 6) + 4 + (-6x + 4) = 8 \cdot (-8x) + 8 \cdot 6 + 4 - 6x + 4 = -64x + 48 + 4 - 6x + 4 = (-64x - 6x) + (48 + 4 + 4) = -70x + 56$$ d) $$(-8x + 6) - (-6x + 4) = -8x + 6 + 6x - 4 = (-8x + 6x) + (6 - 4) = -2x + 2$$ e) $$-(-8x + 6) + (-6x + 4) = 8x - 6 - 6x + 4 = (8x - 6x) + (-6 + 4) = 2x - 2$$